facts about climate change essay

26 facts that bring home the reality of climate change

UNDERSTANDING the many challenges facing our world on the eve of COP26 isn't easy. It's hard to understand a water crisis when some countries are flooding. It's hard to appreciate the Arctic ice disappearing when the winter news is filled with stories of extreme weather events.

But it's this instability of the climate, caused by the slow heating of our world , that is perpetuating these extremes. The consequences can devastate economies, infrastructure and political stability – a situation described in 2011 by UN Secretary General Ban Ki-Moon as an 'unholy brew'. In the same speech Ban called climate change the 'defining issue of our time'. Evidence for that is simply down to the facts. 

(Related: why climate change is still the greatest threat to human health.)  

Greenhouse gases are at a 4.5 million-year high

Mastodons and woolly mammoths roamed the Earth the last time the concentration of carbon dioxide (CO 2 ) in the atmosphere reached today’s levels, at 417 parts per million, according to the National Oceanic and Atmospheric Administration . Scientists say levels of CO 2 , which as a greenhouse gas traps heat and causes global warming, are now comparable to the Pliocene Age, between 4.1 and 4.5 million years ago, when sea level was about 24 metres (78 feet) higher than today and the average temperature was nearly 4 degrees Celcius (°C) (7 degrees Fahrenheit (°F)) warmer. 

Earth's seen 20,000 years of change in 170

Since 1850, human activities have driven up CO2 concentrations by 48% . It took 20,000 years for levels to rise naturally by this extent, from the Last Glacial Maximum , when the Laurentide Ice Sheet covered the northern third of North America as far south as New York City, some 21,500 years ago.

July 2021 was the hottest month ever recorded

First place is the worst place in this race, as July 2021 secured its ranking as the hottest month ever recorded since records began 142 years ago, according to the National Oceanic and Atmospheric Administration . Around the world, the combined land and ocean-surface temperature was 0.93°C (1.67°F) above the 20th-century average of 15.8°C (60.4°F).

Sea ice melts from white into turquoise pools off Baffin Island, Nunavut, Canada. Between 1979 and 2018, the proportion of sea ice five years old or more in the Arctic has reduced from 30% to 2%.

Tree planting isn't enough

A noble and regenerative activity for sure – but relying on it to absorb enough carbon emissions to achieve ‘net zero’ by 2050 would require 1.6 billion hectares of new forests. That’s five times the size of India, or more than all the farmland in the world, says Oxfam . 

UK rain is on the rise...

The UK is suffering more extreme weather events as the climate changes. This summer alone, Greater London has seen 48% more rainfall than the city’s long-term average, and increases of a similar scale have been recorded in Hampshire (up 49%), Surrey (up 54%) and West Sussex (up 52%).  Last year was the UK's fifth wettest year since 1862, with 116% of the 1981–2010 average and 122% of the 1961–1990 average rainfall, according to the International Journal of Climatology .

...and so are heatwaves

The Met Office issued its first ever amber heat warning for the UK in July 2021, and Northern Ireland broke its all-time temperature record on July 21, as the mercury soared to  31.3°C at Castlederg.

Spring is coming earlier

Nature is racing to keep pace with the earlier springs and later autumns brought by rising temperatures. The ‘first leaf’ date for the pedunculate oak in the UK was 10 days earlier in 2020 than the average for 2000–09, according to the International Journal of Climatology . 

The dry, salt-crusted Lake Poopo. Poorly irrigated land, logging or evaporation can cause desertification. The amount of the Earth that is becoming arid grows each year.

Antarctica loses an Everest of ice every year

Antarctica is losing 151 billion tonnes of ice per year, roughly equivalent in weight to the rock that makes  Mount Everest , according to NASA ’s Grace Follow-On satellite.

The homes of 200 million people will be below sea level in 70 years

200 million people in the world, more than three times the UK population, will live below the tideline by the end of this century if levels continue to rise, according to Nature Communications . Sea levels have risen by 178mm (7 inches) since 1900 and are rising by 3.4mm per year. They reached record heights in 2020 for the ninth consecutive year – about 91.3mm (3.6 inches) higher than the 1993 average, when satellite altimeter records began. Sea levels rise because heat stored in the ocean causes water to expand, while melting ice sheets and glaciers are adding to the volume of water. China, Bangladesh and India are particularly vulnerable to rising sea levels, coastal storm surges and flooding, as are the Netherlands and parts of the UK.

Deserts are growing

Each year, more than 12 million hectares of land are lost to desertification, land degradation and drought, according to the UN  – a surface area equivalent to the entire arable land of Germany .

Fires are getting more frequent – and worse

Wildfires , from Australia to California and Greece, are raging for longer and spreading farther than ever before, says the United Nations (UN), which calculates that the blazes devastated roughly 30 million acres of land from 2018-2020, 10 times the size of Yorkshire.

A million species are at risk

A chilling number of Earth's other denizens, including 40 percent of all amphibians known to science (about 3,200 species) is under threat due to human impact, according to the UN . Climate change, pollution, deforestation, overfishing, development, and invasive species are putting biodiversity in peril.

Plastic production is speeding up

Plastic production and use is forecast to double over the next 20 years, and quadruple by the early 2050s, warns the Heinrich Böll Foundation , despite the fact that greenhouse gases, such as CO 2 and methane, are released at every stage of plastic’s lifecycle – from the extraction and refinery of oil to the manufacturing process and end-of-life disposal and incineration. Every year, 17 million barrels of oil are used to make plastic and 13 million tonnes of plastic leak into the ocean, calculates the UN .

75 million kids suffer food insecurity

At least 155 million people, 2.3 times as many as live in the UK, were pushed into acute food insecurity in 2020 due to extreme weather, as well as conflict and economic shocks, says the World Food Programme . Among those suffering were over 75 million children under the age of five who displayed the symptoms of stunted growth. “Weather extremes will continue to exacerbate acute food insecurity in fragile economies,” says the WFP.

Deaths from heatwaves are up – a lot

Blistering temperatures are proving fatal, with The Lancet reporting that during the past 20 years there has been a 53·7% increase in heat-related mortality in people older than 65 years. Globally, this caused the premature deaths of 296,000 people in 2018 alone, enough to fill all the seats at Wembley Stadium three times over.

The concept of tipping points is scary

What many don't realise about the warming of the present Earth is that once we pass a certain threshold, physics takes over. This is at least true for the ice sheets, which – once they hit a rate of melting – can no longer sustain their mass. Known as the surface mass balance (SMB) passing this tipping point means that the ice sheet can no longer sustain its colossal mass based on the amount it is replenished by precipitation, and begins an unstoppable and accelerating decline humans are powerless to stop. With strong mitigation – limiting global temperature rise to ideally 1.5 degrees C, the levels agreed by nations administering the Paris Agreement – the ice sheets will continue to lose mass, but won't pass this critical tipping point. Without it, in a high emissions scenario, scientists are unsure when that tipping point may be hit. But based on the last century, it doesn't look good. 

( Related: climate change is driving the entire planet to a dangerous tipping point. )

Ice colour matters

It's no good just having cold winters to replenish ice levels. White ice – the long term, multi-year ice – reflects sunlight, helping to stave off warming. Thin, black seasonal ice doesn't do that nearly as effectively. Which is why the decline in Arctic sea ice is particularly alarming. According to the IPCC, between 1979 and 2018, the amount of sea ice five years old or above dropped from 30% to 2%. 

A hurricane batters the Florida coast. Scientists believe hurricanes are becoming more intense and moving more slowly due to climate change, increasing their impact on human settlements. 

Climate change is causing extreme weather events

Studies conducted between 2015 to 2020 have shown the ‘fingerprints’ of climate change in 76 floods, droughts, storms, and temperature anomalies, as well as dramatically increasing the risk of wildfires in 114 countries. 

Dangerous diseases are on the move 

Climate change is accelerating the spread of infectious diseases , such as dengue fever and malaria, creating conditions in more regions where the infections can thrive. In 2018, dengue had expanded by as much as 15% compared to a 1950s baseline, according to medical experts at The Lancet . ( Related: seven warmer weather diseases climate change may bring to the UK.)

All Earth faces warming

Nowhere on the planet is spared the impact of climate change. In 2020, record temperatures were recorded in Belarus, Belgium, Estonia, Finland, France, Kazakhstan, Lithuania, Luxembourg, the Netherlands, Norway, Poland, Spain, Sweden, Switzerland and Ukraine, as well as Japan, Mexico, Russia, Seychelles, while the town of Blenheim, New Zealand reported a record-breaking 64-day dry spell, according to the National Centres for Environmental Information .

Antarctica saw t-shirt temperatures in 2020. The Arctic was sweltering

The eve of mid-summer’s day 2020 saw the warmest ever temperature recorded within the Arctic Circle – a crazy 38°C at Verkhoyansk, Russia . Similar warming is evident at the other end of the Earth, where, the Esperanza Station in Antartica reached 18.3°C (64.9°F) on February 6, 2020, the highest temperature ever recorded on the continent.

Coastal erosion stats are staggering

From permafrost thaws causing cliff collapse in Alaska to rising seas and reduced sediment flow in the Mississippi causing a mind-boggling football field sized area of land to be lost every hour from the Louisiana coast, the combination of a warming climate, extreme storms, sea level rise and human activities is literally taking the land from under us.  

The wealthy aren't so green

Between 1990 and 2015, the richest 1% of the world’s population were responsible for more than twice as much carbon emissions as the poorest 50% of humanity, calculates Oxfam . The estimated average carbon footprint of the world’s richest 1% could be up to 175 times  larger than that of someone in the poorest 10%.

The Great Barrier Reef has suffered an apocalypse 

The Great Barrier Reef in Australia  is estimated to have lost half its corals since the 1990s as a sustained rise in ocean temperatures bleached them white and made them uninviting to its colonising organisms. It only takes a spike of 1–2°C in water temperature to have a devastating impact, says the International Union for Conservation of Nature (IUCN). Reefs cover less than 0.1% of the ocean floor, but are home to more than one quarter of all marine fish species.

One third of the most precious habitats are under threat

Vulnerable ecosystems are under threat from climate change, with the IUCN warning that 83 of 252 natural World Heritage sites are at risk, including the Pantanal Conservation Area of Brazil and the Cape Floral Region Protected Areas of South Africa.

EVs have a hidden cost

Electric cars may emit zero tailpipe emissions, but they still have a sizeable carbon footprint from their manufacturing process. One manufacturer's electric SUV has to drive anywhere between 29,000 miles (47,000km) and 90,000 miles (146,000km) – depending on whether it is recharged with wind power or a ‘global energy’ mix that includes electricity generated from fossil fuels – before its greenhouse gas emissions are lower than the petrol model. Walking, cycling and shared public transport offer greener travel options.

A humpback whale and her calf off Vava'u, Kingdom of Tonga.

Renewables are on the rise

Despite demands for coal and gas on the rise, renewables are set to provide over half the increased demand for electricity in 2021. Renewables generation in 2021 is set to expand by over 8% – the largest year on year growth on record.  The price is the energy they generate is also coming down, with the energy produced from renewable sources costing far less to produce than fossil fuel alternatives, with the cost of commissioning new solar, onshore and offshore wind plants falling by, respectively,  16 per cent, 13 per cent and 9 per cent in 2020 . 

Some species are bouncing back

Long the poster creatures for human-catalysed extinction, whales – including blue whales and humpbacks – have seen populations rebound, with record numbers spotted in zones where they were historically depleted. With the increase in sustainably-managed ocean zones and the growth of marine protected areas (MPAs) there is hope that our relationship with Earth's 'life support system' may become less a battle of attrition, and more symbiosis.  

( Related: some catastrophic changes to the climate can still be headed off. )

Technology offers answers

The ingenuity on display when the finalists for the inaugural Earthshot Prize were announced earlier this year are evidence that when applied – whether for profit or philanthropy – humans are ingenious enough to help reverse some of the damage our species has done. Whether creating robust strains of coral , treating waste water or removing the need to burn tons of charcoal a day with a simple solar powered gadget , humans could be as good at saving the environment as we are at impacting it. ( Related: These ideas could help save the world. )  

The world is waking up

A 2020 survey by the Boston Consultancy Group found that from 3,000 participants across eight countries, 70% were more aware now than before COVID-19 "that human activity threatens the climate is and that degradation of the environment, in turn, threatens humans."  The rise in climate activism amongst young people – thought to be amongst the biggest global movements ever – demonstrates a growing awareness of the threat to the future. This, coupled with the dip in emissions due to lockdowns and the knock-on realisation of the impact of our own activities,  aside from the occurrence of the disease in the first place , means that more may be inspired to do more.

Editor's note: a date in the first fact concerning glaciation was clarified on 5/11/21.

National Geographic is committed to encouraging positive action at an individual level to help curb climate change. In the run-up to COP26 , discover more ways we all  can live lighter on the planet  here.

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ENCYCLOPEDIC ENTRY

Climate change.

Climate change is a long-term shift in global or regional climate patterns. Often climate change refers specifically to the rise in global temperatures from the mid-20th century to present.

Earth Science, Climatology

Fracking tower

Fracking is a controversial form of drilling that uses high-pressure liquid to create cracks in underground shale to extract natural gas and petroleum. Carbon emissions from fossils fuels like these have been linked to global warming and climate change.

Photograph by Mark Thiessen / National Geographic

Climate is sometimes mistaken for weather. But climate is different from weather because it is measured over a long period of time, whereas weather can change from day to day, or from year to year. The climate of an area includes seasonal temperature and rainfall averages, and wind patterns. Different places have different climates. A desert, for example, is referred to as an arid climate because little water falls, as rain or snow, during the year. Other types of climate include tropical climates, which are hot and humid , and temperate climates, which have warm summers and cooler winters.

Climate change is the long-term alteration of temperature and typical weather patterns in a place. Climate change could refer to a particular location or the planet as a whole. Climate change may cause weather patterns to be less predictable. These unexpected weather patterns can make it difficult to maintain and grow crops in regions that rely on farming because expected temperature and rainfall levels can no longer be relied on. Climate change has also been connected with other damaging weather events such as more frequent and more intense hurricanes, floods, downpours, and winter storms.

In polar regions, the warming global temperatures associated with climate change have meant ice sheets and glaciers are melting at an accelerated rate from season to season. This contributes to sea levels rising in different regions of the planet. Together with expanding ocean waters due to rising temperatures, the resulting rise in sea level has begun to damage coastlines as a result of increased flooding and erosion.

The cause of current climate change is largely human activity, like burning fossil fuels , like natural gas, oil, and coal. Burning these materials releases what are called greenhouse gases into Earth’s atmosphere . There, these gases trap heat from the sun’s rays inside the atmosphere causing Earth’s average temperature to rise. This rise in the planet's temperature is called global warming. The warming of the planet impacts local and regional climates. Throughout Earth's history, climate has continually changed. When occuring naturally, this is a slow process that has taken place over hundreds and thousands of years. The human influenced climate change that is happening now is occuring at a much faster rate.

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Our Future Is Now - A Climate Change Essay by Francesca Minicozzi, '21

Francesca Minicozzi (class of 2021) is a Writing/Biology major who plans to study medicine after graduation. She wrote this essay on climate change for WR 355/Travel Writing, which she took while studying abroad in Newcastle in spring 2020. Although the coronavirus pandemic curtailed Francesca’s time abroad, her months in Newcastle prompted her to learn more about climate change. Terre Ryan Associate Professor, Writing Department

Our Future Is Now

By Francesca Minicozzi, '21 Writing and Biology Major

 “If you don’t mind me asking, how is the United States preparing for climate change?” my flat mate, Zac, asked me back in March, when we were both still in Newcastle. He and I were accustomed to asking each other about the differences between our home countries; he came from Cambridge, while I originated in Long Island, New York. This was one of our numerous conversations about issues that impact our generation, which we usually discussed while cooking dinner in our communal kitchen. In the moment of our conversation, I did not have as strong an answer for him as I would have liked. Instead, I informed him of the few changes I had witnessed within my home state of New York.

Zac’s response was consistent with his normal, diplomatic self. “I have been following the BBC news in terms of the climate crisis for the past few years. The U.K. has been working hard to transition to renewable energy sources. Similar to the United States, here in the United Kingdom we have converted over to solar panels too. My home does not have solar panels, but a lot of our neighbors have switched to solar energy in the past few years.”

“Our two countries are similar, yet so different,” I thought. Our conversation continued as we prepared our meals, with topics ranging from climate change to the upcoming presidential election to Britain’s exit from the European Union. However, I could not shake the fact that I knew so little about a topic so crucial to my generation.

After I abruptly returned home from the United Kingdom because of the global pandemic, my conversation with my flat mate lingered in my mind. Before the coronavirus surpassed climate change headlines, I had seen the number of internet postings regarding protests to protect the planet dramatically increase. Yet the idea of our planet becoming barren and unlivable in a not-so-distant future had previously upset me to the point where a part of me refused to deal with it. After I returned from studying abroad, I decided to educate myself on the climate crisis.

My quest for climate change knowledge required a thorough understanding of the difference between “climate change” and “global warming.” Climate change is defined as “a pattern of change affecting global or regional climate,” based on “average temperature and rainfall measurements” as well as the frequency of extreme weather events. 1   These varied temperature and weather events link back to both natural incidents and human activity. 2   Likewise, the term global warming was coined “to describe climate change caused by humans.” 3   Not only that, but global warming is most recently attributed to an increase in “global average temperature,” mainly due to greenhouse gas emissions produced by humans. 4

I next questioned why the term “climate change” seemed to take over the term “global warming” in the United States. According to Frank Luntz, a leading Republican consultant, the term “global warming” functions as a rather intimidating phrase. During George W. Bush’s first presidential term, Luntz argued in favor of using the less daunting phrase “climate change” in an attempt to overcome the environmental battle amongst Democrats and Republicans. 5   Since President Bush’s term, Luntz remains just one political consultant out of many politicians who has recognized the need to address climate change. In an article from 2019, Luntz proclaimed that political parties aside, the climate crisis affects everyone. Luntz argued that politicians should steer clear of trying to communicate “the complicated science of climate change,” and instead engage voters by explaining how climate change personally impacts citizens with natural disasters such as hurricanes, tornadoes, and forest fires. 6   He even suggested that a shift away from words like “sustainability” would gear Americans towards what they really want: a “cleaner, safer, healthier” environment. 7

The idea of a cleaner and heathier environment remains easier said than done. The Paris Climate Agreement, introduced in 2015, began the United Nations’ “effort to combat global climate change.” 8   This agreement marked a global initiative to “limit global temperature increase in this century to 2 degrees Celsius above preindustrial levels,” while simultaneously “pursuing means to limit the increase to 1.5 degrees.” 9    Every country on earth has joined together in this agreement for the common purpose of saving our planet. 10   So, what could go wrong here? As much as this sounds like a compelling step in the right direction for climate change, President Donald Trump thought otherwise. In June 2017, President Trump announced the withdrawal of the United States from the Paris Agreement with his proclamation of climate change as a “’hoax’ perpetrated by China.” 11   President Trump continued to question the scientific facts behind climate change, remaining an advocate for the expansion of domestic fossil fuel production. 12   He reversed environmental policies implemented by former President Barack Obama to reduce fossil fuel use. 13

Trump’s actions against the Paris Agreement, however, fail to represent the beliefs of Americans as a whole. The majority of American citizens feel passionate about the fight against climate change. To demonstrate their support, some have gone as far as creating initiatives including America’s Pledge and We Are Still In. 14   Although the United States officially exited the Paris Agreement on November 4, 2020, this withdrawal may not survive permanently. 15   According to experts, our new president “could rejoin in as short as a month’s time.” 16   This offers a glimmer of hope.

The Paris Agreement declares that the United States will reduce greenhouse gas emission levels by 26 to 28 percent by the year 2025. 17   As a leader in greenhouse gas emissions, the United States needs to accept the climate crisis for the serious challenge that it presents and work together with other nations. The concept of working coherently with all nations remains rather tricky; however, I remain optimistic. I think we can learn from how other countries have adapted to the increased heating of our planet. During my recent study abroad experience in the United Kingdom, I was struck by Great Britain’s commitment to combating climate change.

Since the United Kingdom joined the Paris Agreement, the country targets a “net-zero” greenhouse gas emission for 2050. 18   This substantial alteration would mark an 80% reduction of greenhouse gases from 1990, if “clear, stable, and well-designed policies are implemented without interruption.” 19   In order to stay on top of reducing emissions, the United Kingdom tracks electricity and car emissions, “size of onshore and offshore wind farms,” amount of homes and “walls insulated, and boilers upgraded,” as well as the development of government policies, including grants for electric vehicles. 20   A strong grip on this data allows the United Kingdom to target necessary modifications that keep the country on track for 2050. In my brief semester in Newcastle, I took note of these significant changes. The city of Newcastle is small enough that many students and faculty are able to walk or bike to campus and nearby essential shops. However, when driving is unavoidable, the majority of the vehicles used are electric, and many British citizens place a strong emphasis on carpooling to further reduce emissions. The United Kingdom’s determination to severely reduce greenhouse emissions is ambitious and particularly admirable, especially as the United States struggles to shy away from its dependence on fossil fuels.

So how can we, as Americans, stand together to combat global climate change? Here are five adjustments Americans can make to their homes and daily routines that can dramatically make a difference:

• Stay cautious of food waste. Studies demonstrate that “Americans throw away up to 40 percent of the food they buy.” 21   By being more mindful of the foods we purchase, opting for leftovers, composting wastes, and donating surplus food to those in need, we can make an individual difference that impacts the greater good. 22   
• Insulate your home. Insulation functions as a “cost-effective and accessible” method to combat climate change. 23   Homes with modern insulation reduce energy required to heat them, leading to a reduction of emissions and an overall savings; in comparison, older homes can “lose up to 35 percent of heat through their walls.” 24   
• Switch to LED Lighting. LED stands for “light-emitting diodes,” which use “90 percent less energy than incandescent bulbs and half as much as compact fluorescents.” 25   LED lights create light without producing heat, and therefore do not waste energy. Additionally, these lights have a longer duration than other bulbs, which means they offer a continuing savings. 26  
• Choose transportation wisely. Choose to walk or bike whenever the option presents itself. If walking or biking is not an option, use an electric or hybrid vehicle which emits less harmful gases. Furthermore, reduce the number of car trips taken, and carpool with others when applicable. 
• Finally, make your voice heard. The future of our planet remains in our hands, so we might as well use our voices to our advantage. Social media serves as a great platform for this. Moreover, using social media to share helpful hints to combat climate change within your community or to promote an upcoming protest proves beneficial in the long run. If we collectively put our voices to good use, together we can advocate for change.

As many of us are stuck at home due to the COVID-19 pandemic, these suggestions are slightly easier to put into place. With numerous “stay-at-home” orders in effect, Americans have the opportunity to make significant achievements for climate change. Personally, I have taken more precautions towards the amount of food consumed within my household during this pandemic. I have been more aware of food waste, opting for leftovers when too much food remains. Additionally, I have realized how powerful my voice is as a young college student. Now is the opportunity for Americans to share how they feel about climate change. During this unprecedented time, our voice is needed now more than ever in order to make a difference.

However, on a much larger scale, the coronavirus outbreak has shed light on reducing global energy consumption. Reductions in travel, both on the roads and in the air, have triggered a drop in emission rates. In fact, the International Energy Agency predicts a 6 percent decrease in energy consumption around the globe for this year alone. 27   This drop is “equivalent to losing the entire energy demand of India.” 28   Complete lockdowns have lowered the global demand for electricity and slashed CO2 emissions. However, in New York City, the shutdown has only decreased carbon dioxide emissions by 10 percent. 29   This proves that a shift in personal behavior is simply not enough to “fix the carbon emission problem.” 30   Climate policies aimed to reduce fossil fuel production and promote clean technology will be crucial steppingstones to ameliorating climate change effects. Our current reduction of greenhouse gas emissions serves as “the sort of reduction we need every year until net-zero emissions are reached around 2050.” 31   From the start of the coronavirus pandemic, politicians came together for the common good of protecting humanity; this demonstrates that when necessary, global leaders are capable of putting humankind above the economy. 32

After researching statistics comparing the coronavirus to climate change, I thought back to the moment the virus reached pandemic status. I knew that a greater reason underlay all of this global turmoil. Our globe is in dire need of help, and the coronavirus reminds the world of what it means to work together. This pandemic marks a turning point in global efforts to slow down climate change. The methods we enact towards not only stopping the spread of the virus, but slowing down climate change, will ultimately depict how humanity will arise once this pandemic is suppressed. The future of our home planet lies in how we treat it right now. 

• “Climate Change: What Do All the Terms Mean?,” BBC News (BBC, May 1, 2019), https://www.bbc.com/news/science-environment-48057733 )
• Ibid. 
• Kate Yoder, “Frank Luntz, the GOP's Message Master, Calls for Climate Action,” Grist (Grist, July 26, 2019), https://grist.org/article/the-gops-most-famous-messaging-strategist-calls-for-climate-action
• Melissa Denchak, “Paris Climate Agreement: Everything You Need to Know,” NRDC, April 29, 2020, https://www.nrdc.org/stories/paris-climate-agreement-everything-you-need-know)
• “Donald J. Trump's Foreign Policy Positions,” Council on Foreign Relations (Council on Foreign Relations), accessed May 7, 2020, https://www.cfr.org/election2020/candidate-tracker/donald-j.-trump?gclid=CjwKCAjw4871BRAjEiwAbxXi21cneTRft_doA5if60euC6QCL7sr-Jwwv76IkgWaUTuyJNx9EzZzRBoCdjsQAvD_BwE#climate and energy )
• David Doniger, “Paris Climate Agreement Explained: Does Congress Need to Sign Off?,” NRDC, December 15, 2016, https://www.nrdc.org/experts/david-doniger/paris-climate-agreement-explained-does-congress-need-sign )
• “How the UK Is Progressing,” Committee on Climate Change, March 9, 2020, https://www.theccc.org.uk/what-is-climate-change/reducing-carbon-emissions/how-the-uk-is-progressing/)
• Ibid.  
• “Top 10 Ways You Can Fight Climate Change,” Green America, accessed May 7, 2020, https://www.greenamerica.org/your-green-life/10-ways-you-can-fight-climate-change )
• Matt McGrath, “Climate Change and Coronavirus: Five Charts about the Biggest Carbon Crash,” BBC News (BBC, May 5, 2020), https://www.bbc.com/news/amp/science-environment-52485712 )
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Global Warming 101

Everything you wanted to know about our changing climate but were too afraid to ask.

Temperatures in Beijing rose above 104 degrees Fahrenheit on July 6, 2023.

Jia Tianyong/China News Service/VCG via Getty Images

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What is global warming?

What causes global warming, how is global warming linked to extreme weather, what are the other effects of global warming, where does the united states stand in terms of global-warming contributors, is the united states doing anything to prevent global warming, is global warming too big a problem for me to help tackle.

A: Since the Industrial Revolution, the global annual temperature has increased in total by a little more than 1 degree Celsius, or about 2 degrees Fahrenheit. Between 1880—the year that accurate recordkeeping began—and 1980, it rose on average by 0.07 degrees Celsius (0.13 degrees Fahrenheit) every 10 years. Since 1981, however, the rate of increase has more than doubled: For the last 40 years, we’ve seen the global annual temperature rise by 0.18 degrees Celsius, or 0.32 degrees Fahrenheit, per decade.

The result? A planet that has never been hotter . Nine of the 10 warmest years since 1880 have occurred since 2005—and the 5 warmest years on record have all occurred since 2015. Climate change deniers have argued that there has been a “pause” or a “slowdown” in rising global temperatures, but numerous studies, including a 2018 paper published in the journal Environmental Research Letters , have disproved this claim. The impacts of global warming are already harming people around the world.

Now climate scientists have concluded that we must limit global warming to 1.5 degrees Celsius by 2040 if we are to avoid a future in which everyday life around the world is marked by its worst, most devastating effects: the extreme droughts, wildfires, floods, tropical storms, and other disasters that we refer to collectively as climate change . These effects are felt by all people in one way or another but are experienced most acutely by the underprivileged, the economically marginalized, and people of color, for whom climate change is often a key driver of poverty, displacement, hunger, and social unrest.

A: Global warming occurs when carbon dioxide (CO 2 ) and other air pollutants collect in the atmosphere and absorb sunlight and solar radiation that have bounced off the earth’s surface. Normally this radiation would escape into space, but these pollutants, which can last for years to centuries in the atmosphere, trap the heat and cause the planet to get hotter. These heat-trapping pollutants—specifically carbon dioxide, methane, nitrous oxide, water vapor, and synthetic fluorinated gases—are known as greenhouse gases, and their impact is called the greenhouse effect.

Though natural cycles and fluctuations have caused the earth’s climate to change several times over the last 800,000 years, our current era of global warming is directly attributable to human activity—specifically to our burning of fossil fuels such as coal, oil, gasoline, and natural gas, which results in the greenhouse effect. In the United States, the largest source of greenhouse gases is transportation (29 percent), followed closely by electricity production (28 percent) and industrial activity (22 percent). Learn about the natural and human causes of climate change .

Curbing dangerous climate change requires very deep cuts in emissions, as well as the use of alternatives to fossil fuels worldwide. The good news is that countries around the globe have formally committed—as part of the 2015 Paris Climate Agreement —to lower their emissions by setting new standards and crafting new policies to meet or even exceed those standards. The not-so-good news is that we’re not working fast enough. To avoid the worst impacts of climate change, scientists tell us that we need to reduce global carbon emissions by as much as 40 percent by 2030. For that to happen, the global community must take immediate, concrete steps: to decarbonize electricity generation by equitably transitioning from fossil fuel–based production to renewable energy sources like wind and solar; to electrify our cars and trucks; and to maximize energy efficiency in our buildings, appliances, and industries.

A: Scientists agree that the earth’s rising temperatures are fueling longer and hotter heat waves , more frequent droughts , heavier rainfall , and more powerful hurricanes .

In 2015, for example, scientists concluded that a lengthy drought in California—the state’s worst water shortage in 1,200 years —had been intensified by 15 to 20 percent by global warming. They also said the odds of similar droughts happening in the future had roughly doubled over the past century. And in 2016, the National Academies of Science, Engineering, and Medicine announced that we can now confidently attribute some extreme weather events, like heat waves, droughts, and heavy precipitation, directly to climate change.

The earth’s ocean temperatures are getting warmer, too—which means that tropical storms can pick up more energy. In other words, global warming has the ability to turn a category 3 storm into a more dangerous category 4 storm. In fact, scientists have found that the frequency of North Atlantic hurricanes has increased since the early 1980s, as has the number of storms that reach categories 4 and 5. The 2020 Atlantic hurricane season included a record-breaking 30 tropical storms, 6 major hurricanes, and 13 hurricanes altogether. With increased intensity come increased damage and death. The United States saw an unprecedented 22 weather and climate disasters that caused at least a billion dollars’ worth of damage in 2020, but, according to NOAA, 2017 was the costliest on record and among the deadliest as well: Taken together, that year's tropical storms (including Hurricanes Harvey, Irma, and Maria) caused nearly $300 billion in damage and led to more than 3,300 fatalities.

The impacts of global warming are being felt everywhere. Extreme heat waves have caused tens of thousands of deaths around the world in recent years. And in an alarming sign of events to come, Antarctica has lost nearly four trillion metric tons of ice since the 1990s. The rate of loss could speed up if we keep burning fossil fuels at our current pace, some experts say, causing sea levels to rise several meters in the next 50 to 150 years and wreaking havoc on coastal communities worldwide.

A: Each year scientists learn more about the consequences of global warming , and each year we also gain new evidence of its devastating impact on people and the planet. As the heat waves, droughts, and floods associated with climate change become more frequent and more intense, communities suffer and death tolls rise. If we’re unable to reduce our emissions, scientists believe that climate change could lead to the deaths of more than 250,000 people around the globe every year and force 100 million people into poverty by 2030.

Global warming is already taking a toll on the United States. And if we aren’t able to get a handle on our emissions, here’s just a smattering of what we can look forward to:

• Disappearing glaciers, early snowmelt, and severe droughts will cause more dramatic water shortages and continue to increase the risk of wildfires in the American West.
• Rising sea levels will lead to even more coastal flooding on the Eastern Seaboard, especially in Florida, and in other areas such as the Gulf of Mexico.
• Forests, farms, and cities will face troublesome new pests , heat waves, heavy downpours, and increased flooding . All of these can damage or destroy agriculture and fisheries.
• Disruption of habitats such as coral reefs and alpine meadows could drive many plant and animal species to extinction.
• Allergies, asthma, and infectious disease outbreaks will become more common due to increased growth of pollen-producing ragweed , higher levels of air pollution , and the spread of conditions favorable to pathogens and mosquitoes.

Though everyone is affected by climate change, not everyone is affected equally. Indigenous people, people of color, and the economically marginalized are typically hit the hardest. Inequities built into our housing , health care , and labor systems make these communities more vulnerable to the worst impacts of climate change—even though these same communities have done the least to contribute to it.

A: In recent years, China has taken the lead in global-warming pollution , producing about 26 percent of all CO2 emissions. The United States comes in second. Despite making up just 4 percent of the world’s population, our nation produces a sobering 13 percent of all global CO2 emissions—nearly as much as the European Union and India (third and fourth place) combined. And America is still number one, by far, in cumulative emissions over the past 150 years. As a top contributor to global warming, the United States has an obligation to help propel the world to a cleaner, safer, and more equitable future. Our responsibility matters to other countries, and it should matter to us, too.

A: We’ve started. But in order to avoid the worsening effects of climate change, we need to do a lot more—together with other countries—to reduce our dependence on fossil fuels and transition to clean energy sources.

Under the administration of President Donald Trump (a man who falsely referred to global warming as a “hoax”), the United States withdrew from the Paris Climate Agreement, rolled back or eliminated dozens of clean air protections, and opened up federally managed lands, including culturally sacred national monuments, to fossil fuel development. Although President Biden has pledged to get the country back on track, years of inaction during and before the Trump administration—and our increased understanding of global warming’s serious impacts—mean we must accelerate our efforts to reduce greenhouse gas emissions.

Despite the lack of cooperation from the Trump administration, local and state governments made great strides during this period through efforts like the American Cities Climate Challenge and ongoing collaborations like the Regional Greenhouse Gas Initiative . Meanwhile, industry and business leaders have been working with the public sector, creating and adopting new clean-energy technologies and increasing energy efficiency in buildings, appliances, and industrial processes. 

Today the American automotive industry is finding new ways to produce cars and trucks that are more fuel efficient and is committing itself to putting more and more zero-emission electric vehicles on the road. Developers, cities, and community advocates are coming together to make sure that new affordable housing is built with efficiency in mind , reducing energy consumption and lowering electric and heating bills for residents. And renewable energy continues to surge as the costs associated with its production and distribution keep falling. In 2020 renewable energy sources such as wind and solar provided more electricity than coal for the very first time in U.S. history.

President Biden has made action on global warming a high priority. On his first day in office, he recommitted the United States to the Paris Climate Agreement, sending the world community a strong signal that we were determined to join other nations in cutting our carbon pollution to support the shared goal of preventing the average global temperature from rising more than 1.5 degrees Celsius above preindustrial levels. (Scientists say we must stay below a 2-degree increase to avoid catastrophic climate impacts.) And significantly, the president has assembled a climate team of experts and advocates who have been tasked with pursuing action both abroad and at home while furthering the cause of environmental justice and investing in nature-based solutions.

A: No! While we can’t win the fight without large-scale government action at the national level , we also can’t do it without the help of individuals who are willing to use their voices, hold government and industry leaders to account, and make changes in their daily habits.

Wondering how you can be a part of the fight against global warming? Reduce your own carbon footprint by taking a few easy steps: Make conserving energy a part of your daily routine and your decisions as a consumer. When you shop for new appliances like refrigerators, washers, and dryers, look for products with the government’s ENERGY STAR ® label; they meet a higher standard for energy efficiency than the minimum federal requirements. When you buy a car, look for one with the highest gas mileage and lowest emissions. You can also reduce your emissions by taking public transportation or carpooling when possible.

And while new federal and state standards are a step in the right direction, much more needs to be done. Voice your support of climate-friendly and climate change preparedness policies, and tell your representatives that equitably transitioning from dirty fossil fuels to clean power should be a top priority—because it’s vital to building healthy, more secure communities.

You don’t have to go it alone, either. Movements across the country are showing how climate action can build community , be led by those on the front lines of its impacts, and create a future that’s equitable and just for all .

This story was originally published on March 11, 2016 and has been updated with new information and links.

This NRDC.org story is available for online republication by news media outlets or nonprofits under these conditions: The writer(s) must be credited with a byline; you must note prominently that the story was originally published by NRDC.org and link to the original; the story cannot be edited (beyond simple things such as grammar); you can’t resell the story in any form or grant republishing rights to other outlets; you can’t republish our material wholesale or automatically—you need to select stories individually; you can’t republish the photos or graphics on our site without specific permission; you should drop us a note to let us know when you’ve used one of our stories.

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Climate change facts

What do you need to know about climate change?

We’re already seeing the effects of human-caused climate change — but nature can help. Protecting nature today ensures a more sustainable future.

SHARE THESE FACTS ABOUT CLIMATE CHANGE:​

Fact 1: 421 parts per million.

The concentration of carbon dioxide (CO 2 ) in our atmosphere, as of May 2022 Jump to references 1 , is the highest it has been in human history. Tweet this fact

Fact 2: 2023 was the hottest year on record

Analysis by NOAA shows that average global temperatures in 2023 were 2.12 degrees F (1.18 degrees C) warmer than the 20th-century average — and higher than any other year since records began in 1850. Jump to references 2 What's more, the 10 warmest years on record have all been in the past decade. Tweet this fact

Fact 3: 20% of emissions

As much as 20 percent of all global greenhouse gas emissions caused by humans are due to deforestation Jump to references 3 — exceeding the emissions from all of the passenger vehicles on the planet. Jump to references 4 Tweet this fact

Fact 4: Nature is an untapped solution

Tropical forests are incredibly effective at storing carbon , providing at least a third of the mitigation action needed Jump to references 5 to prevent the worst climate change scenarios. Yet nature-based solutions receive only 3 percent of all climate funding. Jump to references 6 Tweet this fact

Fact 5: Fight climate change, improve livelihoods — naturally

Scaling up natural climate solutions , such as restoring degraded forests, could create as many as 20 million new jobs. Jump to references 7 In total, ecosystem restoration creates 3.7 times as many jobs as oil and gas production per dollar. Jump to references 8 Tweet this fact

Fact 6: A disturbing trend

According to the European Union's Copernicus Climate Change Service, average global temperatures in July 2023 were higher than any other month on record Jump to references 9 — and beat the 1991-2020 average temperature for July by 0.72°C. Tweet this fact

Fact 7: 3.6 billion people

As many as 3.6 billion people live in areas of high vulnerability to climate change impacts Jump to references 10 such as droughts, floods, heat waves, extreme weather events and sea-level rise. Tweet this fact

Fact 8: Coastal ecosystems are critical

In a single square mile, mangroves hold as much carbon as the annual emissions of 90,000 cars . If they are destroyed, all that carbon is released into the atmosphere, contributing to climate change. Jump to references 11 Tweet this fact

Fact 9: It’s cheaper to protect nature

Conserving ecosystems is often more cost-effective than human-made interventions. Mangrove trees, which thrive in salty, coastal areas around the world, provide flood protection benefits exceeding US$ 65 billion per year. Jump to references 12 Tweet this fact

Fact 10: Nations are uniting

One hundred ninety-three countries and the European Union have ratified the 2015 Paris Agreement Jump to references 13 , agreeing to limit global warming and adapt to climate change, partly by protecting nature. Tweet this fact

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Join the thousands who have stepped up to protect nature like mangroves, which trap carbon and safeguard coastal communities against sea-level rise and storms.

More Of Our Work

• National Oceanic and Atmospheric Administration. (2022, June). Carbon dioxide now more than 50% higher than pre-industrial levels. U.S. Department of Commerce. https://www.noaa.gov/news-release/carbon-dioxide-now-more-than-50-higher-than-pre-industrial-levels
• National Oceanic and Atmospheric Administration. (2024, January). 2023 was the world’s warmest year on record, by far U.S. Department of Commerce. https://www.noaa.gov/news/2023-was-worlds-warmest-year-on-record-by-far
• Grantham Research Institute on Climate Change and the Environment. (2023, February). What is the role of deforestation in climate change and how can 'Reducing Emissions from Deforestation and Degradation' (REDD+) help?. The London School of Economics and Political Science. https://www.lse.ac.uk/granthaminstitute/explainers/whats-redd-and-will-it-help-tackle-climate-change/
• DeCicco, J., Fung, F., An, F. (2006). Global Warming on the Road: The climate impact of America’s automobiles. Environmental Defense. https://www.edf.org/sites/default/files/5301_Globalwarmingontheroad_0.pdf
• Correction to Supporting Information for Griscom et al., Natural climate solutions. (2019). Proceedings of the National Academy of Sciences, 116(7), 2776–2776. https://doi.org/10.1073/pnas.1900868116
• Buchner, B., Clark, A., Falconer, A., Macquarie, R., Meattle, C., Wetherbee, C. (2019). Global Landscape of Climate Finance 2019. Climate Policy Initiative. https://climatepolicyinitiative.org/publication/global-landscape-of-climate-finance-2019/
• United Nations Environment Programme. (2022, December 8). Nature-based Solutions can generate 20 million new jobs, but “just transition” policies needed [Press release]. https://www.unep.org/news-and-stories/press-release/nature-based-solutions-can-generate-20-million-new-jobs-just
• Jaeger, J. (2021, October 18). Climate-friendly Investments Can Create More Jobs Per Dollar than Polluting Alternatives. World Resources Institute. https://www.wri.org/insights/green-investments-create-more-jobs-polluting-alternatives #:~:text=Ecosystem%20restoration%20creates%203.7%20times,as%20fossil%20fuels%20per%20dollar
• Copernicus Climate Change Service. (2023, August 8). July 2023: Global air and ocean temperatures reach new record highs [Press release]. https://climate.copernicus.eu/july-2023-global-air-and-ocean-temperatures-reach-new-record-highs
• Intergovernmental Panel on Climate Change. (2022). Key Findings of the AR6 Report on Impacts, Adaptation and Vulnerability [Report]. https://www.ipcc.ch/site/assets/uploads/2022/06/WGII_AR6_Presentation_SB56.pdf
• Conservation International. Protect Our Oceans. https://www.conservation.org/act/protect-our-oceans Accessed: 2023-03-10
• Menéndez, P., Losada, I.J., Torres-Ortega, S. et al. The Global Flood Protection Benefits of Mangroves. Sci Rep 10 , 4404 (2020). https://doi.org/10.1038/s41598-020-61136-6
• United Nations Framework Convention on Climate Change. Paris Agreement - Status of Ratification. https://unfccc.int/process/the-paris-agreement/status-of-ratification. Accessed: 2020-06-09.

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• ENVIRONMENT

What is global warming, explained

The planet is heating up—and fast.

Glaciers are melting , sea levels are rising, cloud forests are dying , and wildlife is scrambling to keep pace. It has become clear that humans have caused most of the past century's warming by releasing heat-trapping gases as we power our modern lives. Called greenhouse gases, their levels are higher now than at any time in the last 800,000 years .

We often call the result global warming, but it is causing a set of changes to the Earth's climate, or long-term weather patterns, that varies from place to place. While many people think of global warming and climate change as synonyms , scientists use “climate change” when describing the complex shifts now affecting our planet’s weather and climate systems—in part because some areas actually get cooler in the short term .

Climate change encompasses not only rising average temperatures but also extreme weather events , shifting wildlife populations and habitats, rising seas , and a range of other impacts. All of those changes are emerging as humans continue to add heat-trapping greenhouse gases to the atmosphere, changing the rhythms of climate that all living things have come to rely on.

What will we do—what can we do—to slow this human-caused warming? How will we cope with the changes we've already set into motion? While we struggle to figure it all out, the fate of the Earth as we know it—coasts, forests, farms, and snow-capped mountains—hangs in the balance.

Understanding the greenhouse effect

The "greenhouse effect" is the warming that happens when certain gases in Earth's atmosphere trap heat . These gases let in light but keep heat from escaping, like the glass walls of a greenhouse, hence the name.

Sunlight shines onto the Earth's surface, where the energy is absorbed and then radiate back into the atmosphere as heat. In the atmosphere, greenhouse gas molecules trap some of the heat, and the rest escapes into space. The more greenhouse gases concentrate in the atmosphere, the more heat gets locked up in the molecules.

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Scientists have known about the greenhouse effect since 1824, when Joseph Fourier calculated that the Earth would be much colder if it had no atmosphere. This natural greenhouse effect is what keeps the Earth's climate livable. Without it, the Earth's surface would be an average of about 60 degrees Fahrenheit (33 degrees Celsius) cooler.

A polar bear stands sentinel on Rudolf Island in Russia’s Franz Josef Land archipelago, where the perennial ice is melting.

In 1895, the Swedish chemist Svante Arrhenius discovered that humans could enhance the greenhouse effect by making carbon dioxide , a greenhouse gas. He kicked off 100 years of climate research that has given us a sophisticated understanding of global warming.

Levels of greenhouse gases have gone up and down over the Earth's history, but they had been fairly constant for the past few thousand years. Global average temperatures had also stayed fairly constant over that time— until the past 150 years . Through the burning of fossil fuels and other activities that have emitted large amounts of greenhouse gases, particularly over the past few decades, humans are now enhancing the greenhouse effect and warming Earth significantly, and in ways that promise many effects , scientists warn.

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Human activity isn't the only factor that affects Earth's climate. Volcanic eruptions and variations in solar radiation from sunspots, solar wind, and the Earth's position relative to the sun also play a role. So do large-scale weather patterns such as El Niño .

But climate models that scientists use to monitor Earth’s temperatures take those factors into account. Changes in solar radiation levels as well as minute particles suspended in the atmosphere from volcanic eruptions , for example, have contributed only about two percent to the recent warming effect. The balance comes from greenhouse gases and other human-caused factors, such as land use change .

The short timescale of this recent warming is singular as well. Volcanic eruptions , for example, emit particles that temporarily cool the Earth's surface. But their effect lasts just a few years. Events like El Niño also work on fairly short and predictable cycles. On the other hand, the types of global temperature fluctuations that have contributed to ice ages occur on a cycle of hundreds of thousands of years.

For thousands of years now, emissions of greenhouse gases to the atmosphere have been balanced out by greenhouse gases that are naturally absorbed. As a result, greenhouse gas concentrations and temperatures have been fairly stable, which has allowed human civilization to flourish within a consistent climate.

Greenland is covered with a vast amount of ice—but the ice is melting four times faster than thought, suggesting that Greenland may be approaching a dangerous tipping point, with implications for global sea-level rise.

Now, humans have increased the amount of carbon dioxide in the atmosphere by more than a third since the Industrial Revolution. Changes that have historically taken thousands of years are now happening over the course of decades .

Why does this matter?

The rapid rise in greenhouse gases is a problem because it’s changing the climate faster than some living things can adapt to. Also, a new and more unpredictable climate poses unique challenges to all life.

Historically, Earth's climate has regularly shifted between temperatures like those we see today and temperatures cold enough to cover much of North America and Europe with ice. The difference between average global temperatures today and during those ice ages is only about 9 degrees Fahrenheit (5 degrees Celsius), and the swings have tended to happen slowly, over hundreds of thousands of years.

But with concentrations of greenhouse gases rising, Earth's remaining ice sheets such as Greenland and Antarctica are starting to melt too . That extra water could raise sea levels significantly, and quickly. By 2050, sea levels are predicted to rise between one and 2.3 feet as glaciers melt.

As the mercury rises, the climate can change in unexpected ways. In addition to sea levels rising, weather can become more extreme . This means more intense major storms, more rain followed by longer and drier droughts—a challenge for growing crops—changes in the ranges in which plants and animals can live, and loss of water supplies that have historically come from glaciers.

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• ENVIRONMENT AND CONSERVATION
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Responding to the Climate Threat: Essays on Humanity’s Greatest Challenge

A new book co-authored by MIT Joint Program Founding Co-Director Emeritus Henry Jacoby

From the Back Cover

This book demonstrates how robust and evolving science can be relevant to public discourse about climate policy. Fighting climate change is the ultimate societal challenge, and the difficulty is not just in the wrenching adjustments required to cut greenhouse emissions and to respond to change already under way. A second and equally important difficulty is ensuring widespread public understanding of the natural and social science. This understanding is essential for an effective risk management strategy at a planetary scale. The scientific, economic, and policy aspects of climate change are already a challenge to communicate, without factoring in the distractions and deflections from organized programs of misinformation and denial. 

Here, four scholars, each with decades of research on the climate threat, take on the task of explaining our current understanding of the climate threat and what can be done about it, in lay language―importantly, without losing critical  aspects of the natural and social science. In a series of essays, published during the 2020 presidential election, the COVID pandemic, and through the fall of 2021, they explain the essential components of the challenge, countering the forces of distrust of the science and opposition to a vigorous national response.  

Each of the essays provides an opportunity to learn about a particular aspect of climate science and policy within the complex context of current events. The overall volume is more than the sum of its individual articles. Proceeding each essay is an explanation of the context in which it was written, followed by observation of what has happened since its first publication. In addition to its discussion of topical issues in modern climate science, the book also explores science communication to a broad audience. Its authors are not only scientists – they are also teachers, using current events to teach when people are listening. For preserving Earth’s planetary life support system, science and teaching are essential. Advancing both is an unending task.

About the Authors

Gary Yohe is the Huffington Foundation Professor of Economics and Environmental Studies, Emeritus, at Wesleyan University in Connecticut. He served as convening lead author for multiple chapters and the Synthesis Report for the IPCC from 1990 through 2014 and was vice-chair of the Third U.S. National Climate Assessment.

Henry Jacoby is the William F. Pounds Professor of Management, Emeritus, in the MIT Sloan School of Management and former co-director of the MIT Joint Program on the Science and Policy of Global Change, which is focused on the integration of the natural and social sciences and policy analysis in application to the threat of global climate change.

Richard Richels directed climate change research at the Electric Power Research Institute (EPRI). He served as lead author for multiple chapters of the IPCC in the areas of mitigation, impacts and adaptation from 1992 through 2014. He also served on the National Assessment Synthesis Team for the first U.S. National Climate Assessment.

Ben Santer is a climate scientist and John D. and Catherine T. MacArthur Fellow. He contributed to all six IPCC reports. He was the lead author of Chapter 8 of the 1995 IPCC report which concluded that “the balance of evidence suggests a discernible human influence on global climate”. He is currently a Visiting Researcher at UCLA’s Joint Institute for Regional Earth System Science & Engineering.

Access the Book

View the book on the publisher's website  here .

Order the book from Amazon  here . 

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What Is Climate Change?

Climate change refers to long-term shifts in temperatures and weather patterns. Such shifts can be natural, due to changes in the sun’s activity or large volcanic eruptions. But since the 1800s, human activities have been the main driver of climate change , primarily due to the burning of fossil fuels like coal, oil and gas.

Burning fossil fuels generates greenhouse gas emissions that act like a blanket wrapped around the Earth, trapping the sun’s heat and raising temperatures.

The main greenhouse gases that are causing climate change include carbon dioxide and methane. These come from using gasoline for driving a car or coal for heating a building, for example. Clearing land and cutting down forests can also release carbon dioxide. Agriculture, oil and gas operations are major sources of methane emissions. Energy, industry, transport, buildings, agriculture and land use are among the main sectors  causing greenhouse gases.

Humans are responsible for global warming

Climate scientists have showed that humans are responsible for virtually all global heating over the last 200 years. Human activities like the ones mentioned above are causing greenhouse gases that are warming the world faster than at any time in at least the last two thousand years.

The average temperature of the Earth’s surface is now about 1.1°C warmer than it was in the late 1800s (before the industrial revolution) and warmer than at any time in the last 100,000 years. The last decade (2011-2020) was the warmest on record , and each of the last four decades has been warmer than any previous decade since 1850.

Many people think climate change mainly means warmer temperatures. But temperature rise is only the beginning of the story. Because the Earth is a system, where everything is connected, changes in one area can influence changes in all others.

The consequences of climate change now include, among others, intense droughts, water scarcity, severe fires, rising sea levels, flooding, melting polar ice, catastrophic storms and declining biodiversity.

People are experiencing climate change in diverse ways

Climate change can affect our health , ability to grow food, housing, safety and work. Some of us are already more vulnerable to climate impacts, such as people living in small island nations and other developing countries. Conditions like sea-level rise and saltwater intrusion have advanced to the point where whole communities have had to relocate, and protracted droughts are putting people at risk of famine. In the future, the number of people displaced by weather-related events is expected to rise.

Every increase in global warming matters

In a series of UN reports , thousands of scientists and government reviewers agreed that limiting global temperature rise to no more than 1.5°C would help us avoid the worst climate impacts and maintain a livable climate. Yet policies currently in place point to a 3°C temperature rise by the end of the century.

The emissions that cause climate change come from every part of the world and affect everyone, but some countries produce much more than others .The seven biggest emitters alone (China, the United States of America, India, the European Union, Indonesia, the Russian Federation, and Brazil) accounted for about half of all global greenhouse gas emissions in 2020.

Everyone must take climate action, but people and countries creating more of the problem have a greater responsibility to act first.

We face a huge challenge but already know many solutions

Many climate change solutions can deliver economic benefits while improving our lives and protecting the environment. We also have global frameworks and agreements to guide progress, such as the Sustainable Development Goals , the UN Framework Convention on Climate Change and the Paris Agreement . Three broad categories of action are: cutting emissions, adapting to climate impacts and financing required adjustments.

Switching energy systems from fossil fuels to renewables like solar or wind will reduce the emissions driving climate change. But we have to act now. While a growing number of countries is committing to net zero emissions by 2050, emissions must be cut in half by 2030 to keep warming below 1.5°C. Achieving this means huge declines in the use of coal, oil and gas: over two-thirds of today’s proven reserves of fossil fuels need to be kept in the ground by 2050 in order to prevent catastrophic levels of climate change.

Adapting to climate consequences protects people, homes, businesses, livelihoods, infrastructure and natural ecosystems. It covers current impacts and those likely in the future. Adaptation will be required everywhere, but must be prioritized now for the most vulnerable people with the fewest resources to cope with climate hazards. The rate of return can be high. Early warning systems for disasters, for instance, save lives and property, and can deliver benefits up to 10 times the initial cost.

We can pay the bill now, or pay dearly in the future

Climate action requires significant financial investments by governments and businesses. But climate inaction is vastly more expensive. One critical step is for industrialized countries to fulfil their commitment to provide $100 billion a year to developing countries so they can adapt and move towards greener economies.

To get familiar with some of the more technical terms used in connection with climate change, consult the Climate Dictionary .

Learn more about…

The facts on climate and energy

Climate change is a hot topic – with myths and falsehoods circulating widely. Find some essential facts here .

The science

See the latest climate reports from the United Nations as well as climate action facts .

Causes and Effects

Fossil fuels are by far the largest contributor to the greenhouse gas emissions that cause climate change, which poses many risks to all forms of life on Earth. Learn more .

From the Secretary-General

Read the UN Chief’s latest statements on climate action.

What is net zero? Why is it important? Our  net-zero page  explains why we need steep emissions cuts now and what efforts are underway.

Renewable energy – powering a safer future

What is renewable energy and why does it matter? Learn more about why the shift to renewables is our only hope for a brighter and safer world.

How will the world foot the bill? We explain the issues and the value of financing climate action.

What is climate adaptation? Why is it so important for every country? Find out how we can protect lives and livelihoods as the climate changes.

Climate Issues

Learn more about how climate change impacts are felt across different sectors and ecosystems.

Why women are key to climate action

Women and girls are on the frontlines of the climate crisis and uniquely situated to drive action. Find out why it’s time to invest in women.

Facts and figures

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There is unequivocal evidence that Earth is warming at an unprecedented rate. Human activity is the principal cause.

• While Earth’s climate has changed throughout its history , the current warming is happening at a rate not seen in the past 10,000 years.
• According to the Intergovernmental Panel on Climate Change ( IPCC ), "Since systematic scientific assessments began in the 1970s, the influence of human activity on the warming of the climate system has evolved from theory to established fact." 1
• Scientific information taken from natural sources (such as ice cores, rocks, and tree rings) and from modern equipment (like satellites and instruments) all show the signs of a changing climate.
• From global temperature rise to melting ice sheets, the evidence of a warming planet abounds.

The rate of change since the mid-20th century is unprecedented over millennia.

Earth's climate has changed throughout history. Just in the last 800,000 years, there have been eight cycles of ice ages and warmer periods, with the end of the last ice age about 11,700 years ago marking the beginning of the modern climate era — and of human civilization. Most of these climate changes are attributed to very small variations in Earth’s orbit that change the amount of solar energy our planet receives.

The current warming trend is different because it is clearly the result of human activities since the mid-1800s, and is proceeding at a rate not seen over many recent millennia. 1 It is undeniable that human activities have produced the atmospheric gases that have trapped more of the Sun’s energy in the Earth system. This extra energy has warmed the atmosphere, ocean, and land, and widespread and rapid changes in the atmosphere, ocean, cryosphere, and biosphere have occurred.

Earth-orbiting satellites and new technologies have helped scientists see the big picture, collecting many different types of information about our planet and its climate all over the world. These data, collected over many years, reveal the signs and patterns of a changing climate.

Scientists demonstrated the heat-trapping nature of carbon dioxide and other gases in the mid-19th century. 2 Many of the science instruments NASA uses to study our climate focus on how these gases affect the movement of infrared radiation through the atmosphere. From the measured impacts of increases in these gases, there is no question that increased greenhouse gas levels warm Earth in response.

Scientific evidence for warming of the climate system is unequivocal.

Intergovernmental Panel on Climate Change

Ice cores drawn from Greenland, Antarctica, and tropical mountain glaciers show that Earth’s climate responds to changes in greenhouse gas levels. Ancient evidence can also be found in tree rings, ocean sediments, coral reefs, and layers of sedimentary rocks. This ancient, or paleoclimate, evidence reveals that current warming is occurring roughly 10 times faster than the average rate of warming after an ice age. Carbon dioxide from human activities is increasing about 250 times faster than it did from natural sources after the last Ice Age. 3

The Evidence for Rapid Climate Change Is Compelling:

Global Temperature Is Rising

The planet's average surface temperature has risen about 2 degrees Fahrenheit (1 degrees Celsius) since the late 19th century, a change driven largely by increased carbon dioxide emissions into the atmosphere and other human activities. 4 Most of the warming occurred in the past 40 years, with the seven most recent years being the warmest. The years 2016 and 2020 are tied for the warmest year on record. 5 Image credit: Ashwin Kumar, Creative Commons Attribution-Share Alike 2.0 Generic.

The Ocean Is Getting Warmer

The ocean has absorbed much of this increased heat, with the top 100 meters (about 328 feet) of ocean showing warming of 0.67 degrees Fahrenheit (0.33 degrees Celsius) since 1969. 6 Earth stores 90% of the extra energy in the ocean. Image credit: Kelsey Roberts/USGS

The Ice Sheets Are Shrinking

The Greenland and Antarctic ice sheets have decreased in mass. Data from NASA's Gravity Recovery and Climate Experiment show Greenland lost an average of 279 billion tons of ice per year between 1993 and 2019, while Antarctica lost about 148 billion tons of ice per year. 7 Image: The Antarctic Peninsula, Credit: NASA

Glaciers Are Retreating

Glaciers are retreating almost everywhere around the world — including in the Alps, Himalayas, Andes, Rockies, Alaska, and Africa. 8 Image: Miles Glacier, Alaska Image credit: NASA

Snow Cover Is Decreasing

Satellite observations reveal that the amount of spring snow cover in the Northern Hemisphere has decreased over the past five decades and the snow is melting earlier. 9 Image credit: NASA/JPL-Caltech

Sea Level Is Rising

Global sea level rose about 8 inches (20 centimeters) in the last century. The rate in the last two decades, however, is nearly double that of the last century and accelerating slightly every year. 10 Image credit: U.S. Army Corps of Engineers Norfolk District

Arctic Sea Ice Is Declining

Both the extent and thickness of Arctic sea ice has declined rapidly over the last several decades. 11 Credit: NASA's Scientific Visualization Studio

Extreme Events Are Increasing in Frequency

The number of record high temperature events in the United States has been increasing, while the number of record low temperature events has been decreasing, since 1950. The U.S. has also witnessed increasing numbers of intense rainfall events. 12 Image credit: Régine Fabri,  CC BY-SA 4.0 , via Wikimedia Commons

Ocean Acidification Is Increasing

Since the beginning of the Industrial Revolution, the acidity of surface ocean waters has increased by about 30%. 13 , 14 This increase is due to humans emitting more carbon dioxide into the atmosphere and hence more being absorbed into the ocean. The ocean has absorbed between 20% and 30% of total anthropogenic carbon dioxide emissions in recent decades (7.2 to 10.8 billion metric tons per year). 1 5 , 16 Image credit: NOAA

1. IPCC Sixth Assessment Report, WGI, Technical Summary . B.D. Santer et.al., “A search for human influences on the thermal structure of the atmosphere.” Nature 382 (04 July 1996): 39-46. https://doi.org/10.1038/382039a0. Gabriele C. Hegerl et al., “Detecting Greenhouse-Gas-Induced Climate Change with an Optimal Fingerprint Method.” Journal of Climate 9 (October 1996): 2281-2306. https://doi.org/10.1175/1520-0442(1996)009<2281:DGGICC>2.0.CO;2. V. Ramaswamy, et al., “Anthropogenic and Natural Influences in the Evolution of Lower Stratospheric Cooling.” Science 311 (24 February 2006): 1138-1141. https://doi.org/10.1126/science.1122587. B.D. Santer et al., “Contributions of Anthropogenic and Natural Forcing to Recent Tropopause Height Changes.” Science 301 (25 July 2003): 479-483. https://doi.org/10.1126/science.1084123. T. Westerhold et al., "An astronomically dated record of Earth’s climate and its predictability over the last 66 million years." Science 369 (11 Sept. 2020): 1383-1387. https://doi.org/10.1126/science.1094123

2. In 1824, Joseph Fourier calculated that an Earth-sized planet, at our distance from the Sun, ought to be much colder. He suggested something in the atmosphere must be acting like an insulating blanket. In 1856, Eunice Foote discovered that blanket, showing that carbon dioxide and water vapor in Earth's atmosphere trap escaping infrared (heat) radiation. In the 1860s, physicist John Tyndall recognized Earth's natural greenhouse effect and suggested that slight changes in the atmospheric composition could bring about climatic variations. In 1896, a seminal paper by Swedish scientist Svante Arrhenius first predicted that changes in atmospheric carbon dioxide levels could substantially alter the surface temperature through the greenhouse effect. In 1938, Guy Callendar connected carbon dioxide increases in Earth’s atmosphere to global warming. In 1941, Milutin Milankovic linked ice ages to Earth’s orbital characteristics. Gilbert Plass formulated the Carbon Dioxide Theory of Climate Change in 1956.

3. IPCC Sixth Assessment Report, WG1, Chapter 2 Vostok ice core data; NOAA Mauna Loa CO2 record O. Gaffney, W. Steffen, "The Anthropocene Equation." The Anthropocene Review 4, issue 1 (April 2017): 53-61. https://doi.org/abs/10.1177/2053019616688022.

4. https://www.ncei.noaa.gov/monitoring https://crudata.uea.ac.uk/cru/data/temperature/ http://data.giss.nasa.gov/gistemp

5. https://www.giss.nasa.gov/research/news/20170118/

6. S. Levitus, J. Antonov, T. Boyer, O Baranova, H. Garcia, R. Locarnini, A. Mishonov, J. Reagan, D. Seidov, E. Yarosh, M. Zweng, " NCEI ocean heat content, temperature anomalies, salinity anomalies, thermosteric sea level anomalies, halosteric sea level anomalies, and total steric sea level anomalies from 1955 to present calculated from in situ oceanographic subsurface profile data (NCEI Accession 0164586), Version 4.4. (2017) NOAA National Centers for Environmental Information. https://www.nodc.noaa.gov/OC5/3M_HEAT_CONTENT/index3.html K. von Schuckmann, L. Cheng, L,. D. Palmer, J. Hansen, C. Tassone, V. Aich, S. Adusumilli, H. Beltrami, H., T. Boyer, F. Cuesta-Valero, D. Desbruyeres, C. Domingues, A. Garcia-Garcia, P. Gentine, J. Gilson, M. Gorfer, L. Haimberger, M. Ishii, M., G. Johnson, R. Killick, B. King, G. Kirchengast, N. Kolodziejczyk, J. Lyman, B. Marzeion, M. Mayer, M. Monier, D. Monselesan, S. Purkey, D. Roemmich, A. Schweiger, S. Seneviratne, A. Shepherd, D. Slater, A. Steiner, F. Straneo, M.L. Timmermans, S. Wijffels. "Heat stored in the Earth system: where does the energy go?" Earth System Science Data 12, Issue 3 (07 September 2020): 2013-2041. https://doi.org/10.5194/essd-12-2013-2020.

7. I. Velicogna, Yara Mohajerani, A. Geruo, F. Landerer, J. Mouginot, B. Noel, E. Rignot, T. Sutterly, M. van den Broeke, M. Wessem, D. Wiese, "Continuity of Ice Sheet Mass Loss in Greenland and Antarctica From the GRACE and GRACE Follow-On Missions." Geophysical Research Letters 47, Issue 8 (28 April 2020): e2020GL087291. https://doi.org/10.1029/2020GL087291.

8. National Snow and Ice Data Center World Glacier Monitoring Service

9. National Snow and Ice Data Center D.A. Robinson, D. K. Hall, and T. L. Mote, "MEaSUREs Northern Hemisphere Terrestrial Snow Cover Extent Daily 25km EASE-Grid 2.0, Version 1 (2017). Boulder, Colorado USA. NASA National Snow and Ice Data Center Distributed Active Archive Center. doi: https://doi.org/10.5067/MEASURES/CRYOSPHERE/nsidc-0530.001 . http://nsidc.org/cryosphere/sotc/snow_extent.html Rutgers University Global Snow Lab. Data History

10. R.S. Nerem, B.D. Beckley, J. T. Fasullo, B.D. Hamlington, D. Masters, and G.T. Mitchum, "Climate-change–driven accelerated sea-level rise detected in the altimeter era." PNAS 15, no. 9 (12 Feb. 2018): 2022-2025. https://doi.org/10.1073/pnas.1717312115.

11. https://nsidc.org/cryosphere/sotc/sea_ice.html Pan-Arctic Ice Ocean Modeling and Assimilation System (PIOMAS, Zhang and Rothrock, 2003) http://psc.apl.washington.edu/research/projects/arctic-sea-ice-volume-anomaly/ http://psc.apl.uw.edu/research/projects/projections-of-an-ice-diminished-arctic-ocean/

12. USGCRP, 2017: Climate Science Special Report: Fourth National Climate Assessment, Volume I [Wuebbles, D.J., D.W. Fahey, K.A. Hibbard, D.J. Dokken, B.C. Stewart, and T.K. Maycock (eds.)]. U.S. Global Change Research Program, Washington, DC, USA, 470 pp, https://doi.org/10.7930/j0j964j6 .

13. http://www.pmel.noaa.gov/co2/story/What+is+Ocean+Acidification%3F

14. http://www.pmel.noaa.gov/co2/story/Ocean+Acidification

15. C.L. Sabine, et al., “The Oceanic Sink for Anthropogenic CO2.” Science 305 (16 July 2004): 367-371. https://doi.org/10.1126/science.1097403.

16. Special Report on the Ocean and Cryosphere in a Changing Climate , Technical Summary, Chapter TS.5, Changing Ocean, Marine Ecosystems, and Dependent Communities, Section 5.2.2.3. https://www.ipcc.ch/srocc/chapter/technical-summary/

Header image shows clouds imitating mountains as the sun sets after midnight as seen from Denali's backcountry Unit 13 on June 14, 2019. Credit: NPS/Emily Mesner Image credit in list of evidence: Ashwin Kumar, Creative Commons Attribution-Share Alike 2.0 Generic.

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Climate Change Essay

500+ words essay on climate change.

Climate change is the shift of weather patterns and conditions. We are experiencing rapid change in the climate due to various factors. Needless to say, our earth is experiencing rising global temperatures. Do you think it is a matter of concern? Well yes, you might have heard about the melting glaciers which is resulting in rising sea levels. There has been a drastic change in the climate due to hazardous factors such as pollution, burning coals, industrial waste disposal in the air, etc. All this will result in affecting the environment and its resources. To overcome the issue of climate change, you need to bring social awareness along with stringent measures to protect and preserve the environment. In this climate change essay, we are going to discuss the factors and how to prevent climate change. 

What is Climate Change? 

Climate change is the change in the average weather conditions. We can say that climate change is responsible for change in the normal climatic conditions. These changes result in heavy storms, heat waves, floods, melting glaciers, etc. Our earth is going through a lot of changes with respect to climate, which is impacting the livelihood of people and other living things. Global warming is one aspect of climate change. Due to these factors, carbon dioxide and greenhouse gases are released in the atmosphere. Check out the following causes of climate change given below. 

Climate Change Factors Essay 

Nowadays, we experience extreme weather conditions whether it is cold, heat or rain. Some of the forces or factors that contribute to climate change are greenhouse gas emission, burning of coal, deforestation, air pollution, industrial gas, etc. These factors lead to major climatic change in the earth. Did you know that climate change leads to disastrous events? Yes, it affects the livelihood, health and the resources. It also impacts the water, air and the land we live in. It leads to extreme weather conditions such as droughts, heavy rain, floods, storms, heat waves, forest fires, etc. Moreover, it reduces the quality of drinking water, damages property, pollutes the air and also leads to loss of life. Additionally, it is impacting the life of flora and fauna around us. We need to take extreme measures to prevent climate change. 

Also explore: Learn more about the environment and climate change with Environment essay and Global warming Essay .

How To Prevent Climate Change Essay 

As climate change is hampering the lives and resources of our earth, we need to look out for extreme measures to prevent climate change. Now, what can we do to prevent this? Is it possible for all of us to join and preserve nature? Yes, we can if appropriate strategies are implemented to combat climate change. The different ways to reduce climate change are mentioned below:

• Make policies and agreements on climate change.
• Implement projects on clean energy.
• Create social awareness on climate change. 
• Prohibit deforestation and cutting down trees.
• Conduct capacity building programs on climate change. 
• Keep the surroundings clean. 
• Avoid use of chemical fertilizers.
• Reduce wastage of water and other natural resources. 
• Protect the flora and fauna. 
• Buy energy efficient products and appliances. 
• Plant more trees in the neighbourhood and surrounding areas. 
• Respect the environment and protect its resources. 
• Reduce the consumption of energy.

These are the ways to reduce climate change. If not implemented, you might see an increase in the weather conditions, shortage of drinking water, agricultural yields, and impact on livelihood. Therefore, you must focus on reducing anthropogenic activities so that you can breathe fresh air and drink clean water. These are the small steps to protect the environment and its resources.

We hope this climate change essay was useful to you. Check Osmo’s essays for kids to explore more essays on a wide variety of topics. 

Frequently Asked Questions On Climate Change Essay

What is a climate change essay.

The climate change essay is information on changing weather conditions and its impact on the environment.

How to start a climate change essay?

You can start a climate change essay with an introduction, factors, and the ways to prevent climate change.

What are the main causes of climate change?

The main causes of climate change are deforestation, burning oils, chemical fertilizers, pollution and release of industrial waste in the air, etc.

To find more information, explore related articles such as technology essay and essay on internet . 

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Climate Change: What Must Be Done, Now

Writers argue for eating less meat, relocating to safer zones, promoting nuclear energy and passing a carbon tax.

To the Editor:

Re “ Adults Are Failing Us on Climate ,” by Greta Thunberg, Adriana Calderón, Farzana Faruk Jhumu and Eric Njuguna (Opinion guest essay, Sunday Review, Aug. 22):

I’m upset. I’m worried. I am angry because the adults have ruined Earth for my generation! You have trashed this world; you have polluted it. The fact that I, a 10-year-old, have to write this letter is proving your failure.

But if you believe that we can save the planet, then you can embrace change. You can vote for world leaders who will stop climate change! There are billions of children around the world, and all of us deserve to live in a world with clean oceans, clean air and a healthy planet.

Our lives are already being affected by climate change. Think about how horrible life could be for the next generation if we don’t act now. Heat waves would be so terrible they could actually make parts of the planet unsafe for us. And rising sea levels would be so serious that some coastal areas could become uninhabitable. We are at the beginning of a mass extinction; it’s been estimated that up to 200 species of plants and animals go extinct every single day , and that isn’t acceptable.

We must push world leaders to act on climate change so that life can continue. Change is coming, and only we can fix the future.

Lily G. Haussamen Las Cruces, N.M.

It is time to get serious. The conclusions of the sixth Intergovernmental Panel on Climate Change report on climate change are devastating, and, unfortunately, not surprising. It’s too late to stop the natural disasters, conflicts and resource shortages that are coming.

For those of us who cannot afford to colonize space, here is my dead serious advice: Plan immediately to relocate to a buffer zone — the Great Lakes region or the Northeast — and buy property. Stake yourself on high ground and purchase flood insurance, sewer backup insurance and every kind of insurance. Hook yourself up to solar panels and a backup generator. Build swales and retention ponds to collect excess floodwater. Grow your own food.

If you haven’t already, scrap plans to have (or have more) children. Use the energy you would put toward nurturing a family into nurturing your community and fighting for survival on an increasingly inhospitable planet.

Demanding action from politicians is not enough. Run for office and get other climate activists to run for office. We need a government that actually protects our air, water and soil. Soon it will be a matter of life or death, if it is not already.

Clara Fang Detroit The writer is founder of Climate Diversity.

Re “ Humanity Must Take a Stand on Climate ” (editorial, Aug. 15):

There is no doubt about The Times’s commitment to climate change. So it’s very hard to understand how your editorial can entirely neglect agriculture, which causes roughly one third of direct emissions .

The United Nations predicts a steady increase in meat consumption over the next three decades, and with that increase will come huge increases in carbon emissions, plus methane and nitrous oxide, which are 30 and 300 times more warming than carbon. Education has not stemmed the tide, but making meat from plants and cultivating meat from cells could. No one is coming for anyone’s burger. These technologies create products that are indistinguishable from the meat Americans love, but with a fraction of the direct and indirect adverse climate impact .

We can’t keep ignoring the contribution of agriculture to climate change. If we really believe that climate change is “code red for humanity,” the climate community should support government funding for research as well as private sector incentives for plant-based and cultivated meat.

Bruce Friedrich Washington The writer is the founder and chief executive of the Good Food Institute.

As you say, the industrial world has known about this problem for decades but has done little. The science is clear-cut, but the politics are anything but. Any meaningful actions in the United States are met with stiff resistance from mainly one political party.

Having been concerned about this for a long time, including teaching about the problem at the University of California San Diego, I’m left wondering if before the planet can return to prehumanity conditions, humans have to cease to exist.

Jeffrey Bada Encinitas, Calif. The writer is professor emeritus of marine chemistry, Scripps Institution of Oceanography, University of California San Diego.

Yes, a hotter future for this beautiful Earth is now locked in. And yes, we can and must act immediately to prevent the worst effects and preserve a livable world for our children, grandchildren and all beings.

However, the measures you recommended for mitigating this crisis left out one crucial tool: putting a price on carbon. Prominent economists agree that pricing carbon is the quickest and most effective way to immediately begin to bring down greenhouse gases in the atmosphere and stop escalating temperatures. Returning revenues to American households would help pay for the rising costs of goods and energy, and spur innovation in renewable energy.

Linda Reichert Chester Springs, Pa.

The editorial calls for big investments in wind, solar and nuclear power to move away from fossil fuels and get to zero net carbon emissions by 2050. Although unpopular, nuclear power will play a vital role that must not be undervalued.

While it’s been comforting to see the adoption of renewable power sources (hydro, wind and solar) and the grass roots efforts by citizens’ groups to get a carbon fee and dividend program passed by Congress, it’s not enough. Projections by the Energy Information Administration show that renewables will only cover about 42 percent of our demand for power by 2050. Nevertheless, we must fully phase out fossil fuels by then.

The only way to fill the gap is to accelerate the adoption of nuclear power. After high-profile incidents like Fukushima, the world has been moving in the other direction. We need to reverse this trend and rapidly deploy newer, safer and more cost-effective fourth-generation nuclear power technology . This is essential to halt the accelerating effects of climate change and buy us enough time to implement long-term power solutions.

William L. Bain Bellevue, Wash.

Re “ G.O.P. Shifts on Climate, but Not on Fossil Fuels ” (front page, Aug. 14):

The minuscule changes in policy positions of Republicans acknowledging that climate change is, at least in part, human-caused are an example of cynicism on steroids. It is not because they now understand the science better. It is because the position of denial is so out of step that it’s untenable, even for Republicans comfortable with the Big Lie.

They remain comfortable with another big lie — that we can continue burning fossil fuels and still be OK. They will trot out glib phrases meant to dismiss concern about emissions. They will try any spin to protect fossil fuel interests. Now that they are acknowledging the reality of human-caused climate change, protecting Big Oil is a stunning display of callous cynicism toward the citizens facing climate disasters.

Republicans already know that a carbon tax would reduce emissions and avoid an economic downturn, but they won’t support it until public opinion gives them no choice.

Gary M. Stewart Laguna Beach, Calif.

In an unintended way, Senator Bill Cassidy is absolutely correct when he says, “We cannot live without fossil fuels or chemicals, period, end of story.”

If this level of policy analysis continues to prevail on Capitol Hill, it is “end of story.” Of course we can’t shut down the petrochemical industry overnight, but we must transition quickly to a clean energy economy. The technology exists to do this. What doesn’t exist yet is the political will of the majority of our representatives, Republican and Democrat, to break away from their corporate benefactors and move quickly toward power generation that does not burn fossil fuels.

People, you and I, must get involved to get the message through to our politicians. Otherwise, “end of story” is an apt characterization for our planet.

John Burr Jacksonville, Fla.

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Home / For Educators: Grades 6-12 / Climate Change Basics: Five Facts, Ten Words

Climate Change Basics: Five Facts, Ten Words

Filed under: backgrounders for educators ,.

To simplify the scientific complexity of climate change, we focus on communicating five key facts about climate change that everyone should know. 

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Why should we care about climate change?

Backgrounders for Educators

Having different perspectives about global warming is natural, but the most important thing that anyone should know about climate change is why it matters.  

External Resources

Looking for resources to help you and your students build a solid climate change science foundation? We’ve compiled a list of reputable, student-friendly links to help you do just that!  

Climate Explained: Introductory Essays About Climate Change Topics

Climate Explained, a part of Yale Climate Connections, is an essay collection that addresses an array of climate change questions and topics, including why it’s cold outside if global warming is real, how we know that humans are responsible for global warming, and the relationship between climate change and national security.  

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Climate change.

Climate change refers to changes in the Earth’s climates, at local, regional, or global scales, and is most commonly used to describe anthropogenic, or human-caused, climate change.

Contributors

Shakti Ramkumar

Senior Director Of Global Programs

Student Energy

What is Climate Change?

Climate change is a broad term used to refer to changes in the Earth’s climates, at local, regional, or global scales, and can also refer to the effects of these changes. In recent decades, the term ‘climate change’ is most often used to describe changes in the Earth’s climate driven primarily by human activity since the pre-Industrial period (c. 1850 onwards), particularly the burning of fossil fuels and removal of forests, resulting in a relatively rapid increase in carbon dioxide concentration in the Earth’s atmosphere. 1 2

Global warming is a term often used interchangeably with climate change, as it is one of the most important measures of global changes. Global warming refers to the rise in average global temperatures, which is linked to significant impacts on humans, wildlife, and ecosystems around the world. Because there are more factors and impacts than only rising surface temperatures, the term climate change is used to include these additional impacts. There is strong consensus among scientists, representing 97% of actively publishing climate scientists, that human influence has been the dominant cause of observed warming trends since the 20th century. 3

The concentration of carbon dioxide in the atmosphere has risen from hovering around 280 parts per million (ppm) in pre-Industrial time, to 413 ppm as of early 2020. 4 5 This concentration of carbon dioxide is unprecedented in recorded history. Scientists have reported that we need to return to a ‘safe’ concentration of 350 ppm by 2100 in order to stabilize global warming. 6

The largest anthropogenic  (human caused) source of carbon dioxide emissions is the global energy system, which means transforming the global energy system is one of the most significant ways to reduce greenhouse gas emissions and mitigate climate change.

As of 2019, approximately 81% of the world’s primary energy supply still comes from fossil fuels, (specifically, coal, oil, and natural gas), which result in carbon emissions both upstream (in the extraction and production of the energy) and downstream (during the final consumer use of the energy). 7 Continued reliance on fossil fuel-based energy sources is a barrier to emissions reductions, particularly as energy demand continues to increase around the world.

Why does a global temperature increase of 1.5 ° C matter?

Global warming of 1 °C or 1.5°C represents an average across the planet – many places will warm faster, and see far greater temperature increases. For example, the Arctic is warming 2-3 times faster than any other place on Earth. The effects of global heating are far-reaching, including rising sea levels, glacier retreat, changes in the timing of seasonal events (plants flowering, migration patterns), and a rise in the frequency and severity of extreme weather events. These categories of impacts have direct and indirect consequences on people and wildlife. Direct consequences include displacement of people and communities due to sea level rise and extreme weather events, whereas indirect consequences may include disruptions to economic development, food production, escalation in water crises, and increased public health risks.

  The impacts of climate change will not be evenly felt around the world – people living in the poorest countries and in geographically vulnerable regions (such as small-island states) will be first and most significantly impacted. This is because communities living in poverty are more likely to be exposed to environmental hazards, are often more dependent on natural resource-based livelihoods such as agriculture, and have fewer resources to cope with climate impacts.

Each fractional degree of warming also results in outsized impacts on biodiversity and species extinction, and disturbances in natural ecosystems. 8 Even if carbon emissions in the atmosphere can be absorbed and stabilized over a long period of time, many of the impacts on wildlife, land, water, and people will be irreversible once they occur, which makes halting the release of greenhouse gas emissions, and limiting global warming as much as possible, the first priority.

Dive deeper

Recent blog posts about climate change, globeforum 24 at a glance: student energy attends “the future is regenerative”, march 4, 2024, unlocking the untapped potential of youth in clean cooking: a look back at the 2022 clean cooking forum, april 12, 2023, announcing the global youth energy outlook, august 31, 2020, student energy’s commitment to addressing racial injustice in the sustainable energy transition, june 1, 2020, policy, access, and decentralization: diving into the energy system with rachel kyte, february 13, 2020, student energy at cop25, january 13, 2020, student energy at the un climate action summit, september 20, 2019, external resources.

• Pachauri, R. K., Allen, M. R., Barros, V. R., Broome, J., Cramer, W., Christ, R., … & Dubash, N. K. (2014). Climate change 2014: synthesis report. Contribution of Working Groups I, II and III to the fifth assessment report of the Intergovernmental Panel on Climate Change (p. 151). IPCC. ↩
• Intergovernmental Panel on Climate Change (2013) AR5 WG1 Summary for policy makers, pp. 17. ↩
• Skeptical Science (2017). The 97% consensus on global warming. https://skepticalscience.com/global-warming-scientific-consensus-intermediate.htm ↩
• Yale Environment 360 (2017). How the world passed a carbon threshold and why it matters. https://e360.yale.edu/features/how-the-world-passed-a-carbon-threshold-400ppm-and-why-it-matters ↩
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