Kiera Jefferson
The United States is one of the world's top climate polluters, with its emissions having a significant impact on global warming. While the US has made efforts to reduce its carbon dioxide emissions, it still contributes a large share of global carbon emissions, with its emissions per capita being nearly twice that of China. The US has also historically released more heat-trapping gases than any other country, and its emissions continue to rise, with a 0.2% increase in greenhouse gas emissions in 2022 compared to 2021. The US's large population contributes to its high national carbon emissions, and its economic activity, such as consumption of imported goods, also plays a role. Climate change caused by these emissions has a range of impacts, including ocean acidification, sea level rise, harm to agriculture, and ecosystem damage. Vulnerable communities, including low-income communities, communities of color, and indigenous peoples, are disproportionately affected by the health and economic consequences of climate change.
| Characteristics | Values |
|---|---|
| Impact of America's pollution on the world | America has contributed significantly to global pollution, particularly in greenhouse gas emissions. |
| Historical emissions | America has released more heat-trapping gases than China or India, the world's most populous countries. |
| Per capita emissions | The average American is responsible for nearly twice as much climate pollution as the average person in China. |
| National emissions ranking | America is one of the top global climate polluters, along with China, India, and the European Union. These countries were responsible for 83% of emissions in 2022. |
| Recent emissions trends | In 2022, US greenhouse gas emissions increased by 0.2% compared to 2021, driven by a rebound in economic activity after the COVID-19 pandemic. |
| Clean Power Plan | In 2015, the US announced the Clean Power Plan to reduce carbon pollution from power plants and address climate change. |
| Air quality trends | Since 1980, the US has substantially reduced common air pollutants and their precursors, with a 78% decrease in principal air pollutants between 1970 and 2023. |
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What You'll Learn
America's historical contribution to global warming
America has historically been one of the largest contributors to global warming. Since the start of the industrial revolution, the US has been responsible for over 20% of global emissions, more than any other country. From 1850 to 2021, the US contributed to almost 20% of global cumulative carbon dioxide emissions from fossil fuels and land-use change, accounting for roughly 17% of global warming during this period. Despite representing just 4% of the current world population, America's large population has contributed significantly to its national carbon overspending.
The United States has emitted a quarter of the world's greenhouse gas emissions, with 5.2 billion metric tons of carbon dioxide equivalent in 2020, second only to China. US per capita carbon dioxide emissions started decreasing in the 1970s, but total emissions remained high due to the country's large population. Additionally, the US has a significant impact on global emissions through its consumption of goods manufactured in other countries, particularly China.
America's contribution to global warming has had notable impacts within the country. Since 1970, the US has warmed by 2.6 °F (1.4 °C), with 244 out of 246 analyzed US cities experiencing warming. Climate-related health risks disproportionately affect vulnerable communities, including children, the elderly, the poor, low-income communities, and indigenous peoples in the US. Desertification, caused by shifts in precipitation patterns, has impacted nearly 40% of the US, limiting the land available for agriculture.
The impacts of America's historical contribution to global warming extend beyond its borders. Greenhouse gas emissions from the US have contributed to global climate change, leading to potential humanitarian, trade, and national security issues. For example, climate change-induced food scarcity, conflicts, or mass migration can have global ramifications. While the US has taken some steps to address climate change, such as the Clean Power Plan announced by President Obama in 2015, the country still faces challenges in reducing its emissions and mitigating the impacts of global warming.
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US per capita emissions vs China's
The United States and China are two of the world's largest emitters of carbon dioxide, with their emissions contributing significantly to global warming. In 2019, China's emissions surpassed those of the US and, for the first time, exceeded those of all developed countries combined. China's per capita emissions have been lower than those in the US, but they are rising.
Historically, the US has emitted more carbon dioxide into the atmosphere than any other country, with its per capita emissions being 20 times those of China in 1973. However, the US began lowering its per capita carbon dioxide emissions in the 1970s, passing legislation to reduce conventional pollutants and adopting a cap-and-trade program for sulfur dioxide emissions in 1990. By 2000, US per capita emissions had dropped to 21 metric tons per year, while China's had risen to 2.9. Despite this, the US still led China in per capita emissions through 2021.
China's emissions have been rapidly increasing, and in 2019, they surpassed not only the US but also the combined emissions of all developed countries. China's per capita emissions have been lower than those of the US, but the gap is narrowing. In 2019, China's per capita emissions reached 10.1 tons, nearly tripling over the past two decades. This was just below the OECD average of 10.5 tons/capita, while the US had the highest per capita emissions at 17.6 tons/capita.
China's rise in emissions is partly due to its manufacturing sector, with many of the resulting products being purchased by American consumers. The US imported $450.4 billion worth of goods from China in 2020. This highlights the interconnectedness of national emissions, as American consumption contributes to China's manufacturing emissions.
Both countries have committed to reducing their CO2 emissions and have announced plans and policies to meet those commitments. The US has a decentralized capacity to implement and monitor national air pollution standards, while China is working to develop monitoring and enforcement capacity at the provincial level. However, China's large population and varying provincial circumstances pose structural challenges to transitioning to a low-carbon economy.
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The Clean Power Plan
The United States has historically been one of the world's largest emitters of greenhouse gases, with carbon dioxide emissions from fossil fuel combustion increasing by 8% in 2022 compared to 2020. The Clean Power Plan, announced by President Obama in August 2015, was a significant policy initiative aimed at reducing carbon pollution from power plants, which are the nation's largest source of such pollution.
The plan set flexible and achievable standards for power plants, with customized goals for each state to reduce carbon emissions. This approach allowed states the freedom to design their own most cost-effective path toward cleaner energy sources, with the possibility of the EPA stepping in if a state refused to submit a plan. The Clean Power Plan was designed to strengthen the trend toward cleaner and lower-polluting American energy, while also maintaining energy reliability and affordability for all Americans.
The plan was projected to have significant health and environmental benefits. By reducing pollutants that contribute to smog and soot, the Clean Power Plan was estimated to prevent 140,000 to 150,000 asthma attacks among children and 2,700 to 6,600 premature deaths. It was also expected to reduce carbon pollution from the power sector by 32% by 2030, relative to 2005 levels. This would have resulted in 870 million fewer tons of carbon pollution, with significant economic savings for consumers.
However, the Clean Power Plan faced some challenges and opposition. In March 2017, President Donald Trump signed an executive order for the EPA to review the plan, and the US withdrew from the Paris Climate Agreement shortly after. The Clean Power Plan was replaced by the Affordable Clean Energy rule in 2019, but this was later vacated, creating an opportunity for the Biden administration to introduce the "Clean Power Plan 2.0" in 2024. This new set of rules aims to reduce carbon dioxide emissions from electrical power generation and promote renewable energy sources.
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Climate change impacts on the US
The United States has historically been one of the world's largest emitters of greenhouse gases, with total emissions exceeding those of China and India in 2021. While the US has reduced per capita carbon dioxide emissions since the 1970s, it has still contributed significantly to global warming. The effects of climate change impact the US in various ways, including:
Health
Climate change poses risks to the health of Americans, particularly vulnerable groups such as children, the elderly, the poor, and indigenous communities. Heatwaves, degraded air quality, and extreme weather events associated with climate change can lead to increased deaths, illnesses, and economic challenges. Warmer temperatures also increase the frequency and intensity of heat waves, affecting human health and productivity.
Food Supply and Agriculture
Climate change impacts the food supply and agricultural practices in the US. Higher temperatures, droughts, water stress, diseases, and weather extremes create challenges for farmers and ranchers. Changes in precipitation patterns, including heavier rainfall and more frequent droughts, impact water resources and agriculture, especially in the Western United States.
Infrastructure
Existing infrastructure in the US may not be designed to withstand the extreme weather events brought about by climate change, including heavy rains, floods, and temperature changes. Coastal infrastructure is particularly vulnerable to rising sea levels. Increased temperatures also put a strain on energy grids as cooling demands increase.
Ecosystems and Biodiversity
Climate change impacts ecosystems and biodiversity in the US. Ocean acidification, caused by the absorption of carbon dioxide from fossil fuel combustion, affects marine life. Changing temperatures and precipitation patterns impact plant and animal species, with some expanding their geographic ranges and harming existing species.
Security and Trade
Climate change impacts in certain regions of the world may lead to food scarcity, conflicts, or mass migration, raising humanitarian, trade, and national security issues for the United States.
To address these challenges, the US has taken steps such as the Clean Power Plan, which aims to reduce carbon pollution from power plants, and adaptation measures such as strengthening water conservation programs and developing early warning systems for extreme weather events.
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Greenhouse gas emissions in 2022
The United States is the largest historical emitter of man-made climate pollution. In 2022, the country's greenhouse gas emissions increased by 0.2% compared to 2021 levels, or by 1.3% according to another source. This was the second year in a row that emissions had increased. The increase in total greenhouse gas emissions was driven by a rise in CO2 emissions from fossil fuel combustion, which increased by 8% relative to 2020 and 1% relative to 2021. CO2 emissions from natural gas consumption rose by 5% compared to 2021, while emissions from coal consumption fell by 6%. Overall, 60% of electricity in the US in 2022 came from burning fossil fuels, mostly coal and natural gas.
The largest sources of greenhouse gas emissions in the US in 2022 were electricity production, transportation, industry, agriculture, and forestry. The commercial, residential, and industrial sectors accounted for a large share of emissions when indirect emissions from electricity use were included. The total US greenhouse gas emissions in 2022 were 6,343.2 million metric tons of CO2 equivalent. Land use, land-use change, and forestry in the country offset 13% of these emissions.
The US has taken some steps to reduce its greenhouse gas emissions, such as the Clean Power Plan announced by President Obama and the EPA in 2015. However, the Trump administration sought to reverse a 2009 EPA finding that greenhouse gases endanger people and are subject to regulation under the Clean Air Act. The US has also committed to the Paris Agreement, which aims to reduce global emissions and limit warming. Despite these efforts, the US still faces challenges in reducing its emissions and addressing the impacts of climate change, including ocean acidification, sea level rise, harm to agriculture and forests, and ecosystem damage.
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Frequently asked questions
America is one of the world's top climate polluters, dominating the top 20 global climate polluters alongside China, India, and the European Union. In 2022, these four were responsible for 83% of emissions.
America has lowered per capita carbon dioxide emissions since the 1970s. In 2015, President Obama and the EPA announced the Clean Power Plan, which aims to reduce carbon pollution from power plants and strengthen the trend toward cleaner and lower-polluting American energy. In 2022, US President Joe Biden signed the Inflation Reduction Act, the largest climate investment in the country's history.
Those most vulnerable to climate-related health effects, such as children, the elderly, the poor, and future generations, face disproportionate risks. Low-income communities and some communities of color are disproportionately affected by climate change-related impacts, including heatwaves, degraded air quality, and extreme weather events.
Much of China's rising emissions are related to manufacturing, and many of these products are purchased by American consumers. In 2020, the US imported $450.4 billion worth of goods from China.
