Greta Jimenez
The United States, with only about 4-5% of the global population, is responsible for 11% of global carbon emissions, making it the second-largest emitter in the world after China. Per capita emissions in the US are 2.2 times greater than in China, and the average American burns twice as much fossil fuel as the average person in Europe or Japan and 10 times as much as the average person in India. While the US has historically been the biggest carbon polluter, China surpassed it a decade ago, and its emissions today are about double the American figure.
| Characteristics | Values |
|---|---|
| Global share of carbon emissions | 28% |
| Global share of energy use | 30% |
| Global share of pollution from transport | Largest source of direct greenhouse gas emissions |
| Global share of pollution from industry | Third-largest source of direct emissions |
| Global share of pollution from commercial and residential | N/A |
| Global share of pollution from agriculture | N/A |
| Global share of pollution from land use and forestry | Net sink, offsetting 13% of total gross greenhouse gas emissions |
| Share of global population | 5% |
| Per capita emissions rate compared to China | 2.2 times greater |
| Per capita emissions rate compared to the UK | 2.6 times greater |
| Cumulative carbon dioxide emissions | Most in the world |
| Current global share of carbon emissions | 11% |
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What You'll Learn
The US is the second-largest emitter of greenhouse gases
The United States is the second-largest emitter of greenhouse gases, accounting for 11% of global emissions. While China surpassed the US in the mid-2000s to become the largest emitter, the US has emitted the most to date in cumulative terms: more than a quarter of all historical CO2, twice that of China.
The US has made progress in cutting greenhouse gas emissions, particularly through changes in its power industry. Since 2005, emissions from this sector have fallen by over 35%, thanks to a shift from coal-fired power to natural gas and renewable energy sources. Despite these efforts, the US still emitted 16.1 tons of carbon per person in 2015, compared to 6.2 tons per person in the UK.
Transportation is now the most carbon-polluting sector in the US, responsible for the largest share of direct greenhouse gas emissions. Over 94% of the fuel used in this sector is petroleum-based, resulting in high levels of direct emissions. California has taken the initiative in reducing emissions from transportation, implementing an Advanced Clean Cars Program and a Low Carbon Fuel Standard, which requires petroleum producers to reduce the amount of CO2 in their products.
The industrial sector is the third-largest source of direct emissions in the US, primarily from burning fossil fuels for energy and certain chemical reactions to produce goods from raw materials. If indirect emissions from electricity use are included, industry accounts for a much larger share of US greenhouse gas emissions.
Agriculture is another source of emissions, with livestock, agricultural soils, and rice production contributing to both direct and indirect emissions. However, in the US, managed forests and other lands have acted as a net sink since 1990, absorbing more CO2 from the atmosphere than they emit and offsetting 13% of total gross emissions.
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The US emitted over a quarter of all historical CO2
The United States has emitted more CO2 than any other country to date, with around 400 billion tons since 1751. This accounts for almost a quarter of all historical CO2 emissions, or even a third according to some sources. In comparison, China, the world's second-largest contributor, has emitted about half as much.
The US is considered the largest contributor to human-caused climate change. From 1990 to 2005, US CO2 emissions from energy consumption increased by almost 20% to six billion metric tons. Since then, the country has managed to cut its emissions by more than 17%. The biggest annual reduction during this period was in 2020, when the COVID-19 pandemic caused CO2 levels to drop by 11% to their lowest level in almost four decades.
The US accounts for about 5% of the global population but is responsible for 30% of global energy use and 28% of carbon emissions. This results in a US per capita emissions rate 2.2 times greater than that of China, which houses about 20% of the world's population. The US emitted 16.1 tons of carbon per person in 2015, compared to just 6.2 tons per person in the UK.
In 2022, the transportation sector was the largest contributor to US emissions, accounting for 28.4% of emissions. Electric power (power plants) was the second-largest contributor, accounting for approximately 25%.
Some US states have implemented initiatives to reduce emissions. California, for example, has an Advanced Clean Cars Program to reduce pollution from cars, as well as a cap-and-trade program that gives companies allowances for carbon emissions, which are lowered over time. In 2015, Hawaii became the first US state to pass legislation mandating that all the state's electricity come from renewable sources before the middle of the century.
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The US emitted 16.1 tons of carbon per person in 2015
The United States is responsible for a large proportion of the world's pollution. While the U.S. is currently the world's second-largest emitter of greenhouse gases (GHGs), it has produced more cumulative carbon dioxide (CO₂) than any other nation to date. In 2015, the United States emitted 16.1 tons of carbon per person. This is more than twice the per capita emissions rate of China, which houses about 20% of the world's population.
The high per capita emissions in the U.S. are due in part to the country's large share of global energy use. While the U.S. accounts for only about 5% of the global population, it is responsible for 30% of global energy use and 28% of carbon emissions. The U.S. has made some progress in reducing its GHG emissions, particularly through changes in the power industry. At the turn of the century, power generation was the largest source of U.S. emissions. However, a shift away from coal-fired power towards natural gas and renewable energy sources has resulted in emissions from this sector falling by more than 35% since 2005.
Despite these efforts, emissions reductions in the U.S. will need to occur at a faster rate if the country is to meet its climate targets. Additionally, while China may have lower per capita emissions, its larger population results in over 70% more carbon dioxide emissions annually than in the United States. Overall, the U.S. emitted more than a quarter of all historical CO2 to date, which is twice that of China, the second-largest contributor.
Some U.S. states have implemented initiatives to reduce pollution. For example, California has an Advanced Clean Cars Program and a Low Carbon Fuel Standard, which have helped make it a leader in reducing emissions from the transportation sector. Vermont has also committed to ambitious targets for reducing emissions, aiming for an 80-95% reduction below 1990 levels by 2050.
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The US has reduced emissions by over 17% since 2005
The United States has historically been one of the world's biggest carbon emitters, with the country's large population, industry, and transport networks contributing to high levels of pollution. Despite this, the US has reduced emissions by over 17% since 2005, according to the Environmental Protection Agency's (EPA) Annual US Greenhouse Gas Inventory (GHG Inventory). This is a positive step towards reducing the country's impact on the environment and addressing climate change.
The US has made significant progress in cutting greenhouse gas emissions, particularly in the power industry. At the turn of the century, power generation was the largest source of US emissions. However, a shift away from coal-fired power towards natural gas and renewable energy sources has resulted in a more than 35% reduction in emissions from this sector since 2005. This transition to cleaner energy sources has been a key driver of the overall decrease in US emissions.
While the US has made notable efforts to reduce emissions, it is important to acknowledge that it is still the second-largest emitter of greenhouse gases globally, with a per capita emissions rate 2.2 times greater than that of China. The country's large population and high energy consumption contribute to its significant share of global carbon emissions. Additionally, certain states within the US are falling behind in their emissions reduction efforts, with some states reversing environmental policies and protections.
To further reduce emissions, the US can look to states like California and Vermont as examples. California has implemented several initiatives to reduce pollution from cars and lower carbon emissions from fuel producers. Meanwhile, Vermont has committed to ambitious targets for reducing emissions, with a focus on transitioning to renewable energy sources. By adopting similar measures and continuing to invest in renewable energy, the US can accelerate its progress towards meeting its climate targets and reducing its environmental impact.
The US has taken important steps towards reducing emissions and improving air quality, as evidenced by the over 17% reduction in emissions since 2005. However, to effectively address climate change and mitigate its environmental impact, the US must continue to prioritize emissions reduction, improve energy efficiency, and encourage the adoption of renewable energy sources. By doing so, the US can play a key role in global efforts to combat climate change and create a more sustainable future.
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The US's per capita emissions rate is 2.2 times greater than China's
The United States is the world's second-largest emitter of greenhouse gases, having been surpassed by China in the mid-2000s. However, the US has emitted the most carbon dioxide to date, with more than a quarter of all historical CO2 emissions, twice that of China, which is the second-largest contributor. The US has a larger share of responsibility for current conditions, both nationally and per person. In 2021, the US per capita carbon dioxide emissions were nearly twice as large as China's, and this has been the case for several decades. In 1973, US per capita carbon dioxide emissions were 20 times those of China. By 2000, US per capita emissions had dropped to 21 metric tons per year, while China's had risen to 2.9, meaning US per capita emissions were seven times those of China.
The US has made progress in cutting emissions, but reductions need to happen faster if the country is to meet its climate targets. Changes in the power industry have contributed to reductions, with a shift away from coal-fired power in favor of natural gas and renewable energy sources. As a result, emissions from this sector have fallen by more than 35% since 2005. However, the transportation sector, which now accounts for 26% of US carbon emissions, has only seen a 7% reduction in emissions during this time. In contrast, China is leading on developing renewable energy, spending $546 billion on "low-carbon energy transition" in 2022.
Despite China's rising emissions, the US should not abandon its efforts to reduce emissions. As the country with the largest, most dynamic economy, the US has an outsized responsibility to help fight climate change. Furthermore, the argument that US emission reductions are pointless if China does not do the same is flawed. If heat-trapping emissions continue, their origin will matter less than their magnitude and duration. Every country must contribute to solving the climate crisis, and the US can play a leadership role in this regard.
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Frequently asked questions
The United States is responsible for 11% of global pollution, making it the second-largest emitter of greenhouse gases in the world.
America has emitted the most carbon dioxide to date, with almost a third of the excess carbon dioxide in the atmosphere attributed to the country. China is the next largest contributor, emitting less than half of the US's total.
America's emissions have decreased by more than 17% since 2005, with the biggest reduction occurring in 2020 due to the COVID-19 pandemic.
