Helena Joyce
The countries that emit the most carbon dioxide are China, the United States, and India. China has been the largest emitter of CO2 since 2006, with 9.9 billion tonnes of CO2 emitted in 2022. The US has been the largest emitter over time, and India is third, with emissions steeply rising. The EU and the US top the chart in part because of their outsized responsibility for historical emissions. China, the US, and India are the three most industrialised countries in the world, and their carbon footprint per capita tells a different story. Germany is the European country with the highest CO2 emissions, contributing over a quarter of the entire European Union's CO2 emissions.
| Characteristics | Values |
|---|---|
| Countries with the highest CO2 emissions | China, the United States, and India |
| Country with the highest CO2 emissions in Europe | Germany |
| Countries with the highest CO2 emissions per capita | Located in the Arabian Peninsula |
| Country with the highest CO2 emissions historically | The United States |
| Country with the highest number of contaminated cities | India |
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What You'll Learn
China, the US and India are the top three polluters
China, the US, and India are the top three polluters worldwide. China's pollution issues have intensified following its industrialization, causing environmental and health problems. Soil pollution has impacted 38,610 square miles of cultivated land, and contaminated water has affected a further 31.5 million square miles. China's rapid industrialization has also led to increased "white pollution," referring to the proliferation of plastic bags, Styrofoam containers, and light-colored materials in the environment.
The New York Times highlighted the severity of China's environmental degradation, stating that pollution poses a significant burden on the Chinese public and a political challenge to the ruling Communist Party. According to the Chinese Ministry of Health, industrial pollution has made cancer the leading cause of death in the country. Moreover, ambient air pollution kills hundreds of thousands of citizens annually, and 500 million people lack access to safe and clean drinking water.
The US has made significant progress in improving air quality since 1980. The Environmental Protection Agency (EPA) reports that emissions of common air pollutants and their precursors have substantially decreased over the years. This improvement is attributed to various factors, including the phase-out of leaded gasoline, emissions controls, and technological advancements. Despite this progress, challenges remain, as approximately 140 million people lived in counties with pollution levels above the primary National Ambient Air Quality Standards (NAAQS) in 2023.
India is also one of the world's most polluted countries, with Delhi being the most polluted capital city globally. Seventeen of the world's 30 cities with the worst air pollution are in India. The main causes of air pollution in India include thermal power plants, vehicle emissions, industrial emissions, burning of crop residue, and the use of wood and dirty fuels for cooking and heating. The health impacts are severe, with air pollution contributing to over 2 million deaths annually and causing respiratory and cardiovascular diseases. The Indian government has launched initiatives like the National Clean Air Program to address this issue.
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The EU is also a significant contributor
The EU has set ambitious targets for reducing emissions and combating climate change. In 2021, the EU made climate neutrality and the goal of reaching net-zero emissions by 2050 legally binding. It also set an interim target of a 55% emission reduction by 2030. The EU has seen consistent decreases in emissions from 1990 to 2023, with an 8% drop in emissions from 2022 to 2023. International aviation and shipping are the fastest-growing sources of emissions for the EU, with emissions from planes projected to increase significantly by 2050.
While the EU has made progress in reducing emissions, air pollution continues to have negative impacts on human health and ecosystems in Europe. In 2021, 97% of the EU's urban population was exposed to concentrations of fine particulate matter (PM2.5) above the World Health Organization's guidelines, which can lead to respiratory diseases, asthma, lung cancer, and stroke. Additionally, in 2020, 75% of the EU's ecosystems were exposed to levels of nitrogen that can cause eutrophication, affecting agricultural crops, forests, and biodiversity.
Hungary, Romania, and Poland have been identified as EU countries with lagging climate policies, receiving low grades from climate and energy policy experts. These countries have been criticized for counter-productive policies restricting the deployment of renewable energy sources. However, it is important to consider not only climate policies but also their implementation when assessing the EU's worst polluters.
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India's emissions are rising steeply
India is the third most polluting country in terms of carbon dioxide emissions. In 2022, India's fossil CO2 emissions were 2,693,034,100 tons, a 6.52% increase from 2021. India's per capita emissions are equivalent to 1.89 tons per person, a 5.7% increase from 2021. India's emissions are projected to continue rising as the country develops.
India's high emissions are largely due to its burning of fossil fuels. Fossil fuels are the predominant source of residential emissions in most countries, and India is no exception. India has a high dependence on oil, coal, gas, and other fossil fuels for power generation and industrial processes. Coal, in particular, is a major contributor to India's emissions. While the country is investing in renewable energy projects, it remains reliant on coal, which releases carbon dioxide into the atmosphere when burned.
India's emissions are also impacted by its transportation sector. Cars are a significant source of emissions, despite the growing popularity of electric vehicles. Additionally, India's share of energy-intensive industries, such as steel and chemicals, contributes to its high emissions.
The country has had laws protecting air quality since 1981, but the burning of fossil fuels has continued to grow. India's rapid industrialization and economic development have led to increased emissions. As a result, India has experienced several environmental emergencies and high levels of deforestation and animal hunting.
While India's per capita emissions are lower than those of China and the United States, its overall emissions are significant. India's large population means that its annual emissions figures can be misleading when comparing its contribution to climate change with other countries. However, India is making efforts to reduce its greenhouse gas emissions by investing in renewable energy sources, such as wind farms.
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China's emissions are driven by coal use
China, the world's second-largest economy and the most populous country, has the highest carbon dioxide emissions of any country. China's emissions are driven by its heavy reliance on coal, which is used to power its heavy industries, such as steel, cement, and manufacturing. China is home to half of the world's coal power plants, and coal is the main source of energy for the country.
China's coal-based industries are a key driver of its economic growth, and the country has continued to invest in coal-based infrastructure, even as it has pledged to reduce its carbon emissions. For example, China is building large numbers of coal-fired power plants to drive its post-pandemic economy, and it continues to invest in coal-based steelmaking. This has led to concerns that China's decarbonization plans and its goal of carbon neutrality by 2060 may be at risk.
However, there are some signs that China is beginning to reduce its reliance on coal. In the first quarter of 2025, China's CO2 emissions from the power sector fell by 5.8%, due to a 4.7% drop in thermal power generation, mainly from coal and gas. This reduction was driven by increases in solar, wind, and nuclear power generation, as well as improvements in coal power plant efficiency.
China's leadership has signaled a commitment to deeper decarbonization, and it has pledged to reach a peak in emissions by 2030 and achieve carbon neutrality by 2060. However, analysts have pointed out that China's five-year plans have continued to prioritize economic growth over emissions reduction, and it remains to be seen whether the country will be able to flatten its carbon emissions curve in the next decade.
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The US has been the biggest polluter over time
The US has been the biggest polluter in history. While China may have been the biggest polluter in 2022, the US has emitted the largest amount of carbon dioxide over time. With just over 4% of the world's population, the US is responsible for almost a third of the excess carbon dioxide that is heating the planet. In comparison, China, with a population four times that of the US, is responsible for less than a sixth.
The US has built its economy and wealth on burning coal, oil, and natural gas. In 2007, America's fleet of coal-fired power plants emitted more than 80% of CO2 pollution from US power plants and 36% of the country's total CO2 pollution. The US also emitted disproportionate amounts of smog- and soot-forming pollutants, toxic mercury, and other toxic air pollutants. Two-thirds of fossil-fuel electricity was generated by plants built before 1980, and the oldest plants—some of which have been in operation for as long as 70 years—are located in Indiana, Wisconsin, New York, Iowa, and North Carolina.
The US has also been a major emitter of greenhouse gases. While China surpassed the US in emissions about a decade ago and its emissions today are about double the American figure, the average American is responsible for nearly twice as much climate pollution as the average person in China. Additionally, the US has been slow to take action on climate change. In 2017, the Trump administration walked away from the Paris Climate Deal, arguing that meeting the terms of the agreement would harm the American economy and lead to job losses. However, in 2022, US President Joe Biden signed the Inflation Reduction Act, the largest climate investment in the country's history.
The US's historical responsibility for emissions means that it must take significant action to reduce its planet-heating pollution. Energy experts argue that the US must move to clean energy and leave old, inefficient, and dirty technology behind. While levels of planet-heating pollution have been declining in the US in recent years, there is still a long way to go to achieve net zero by 2050.
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Frequently asked questions
China, the United States, and India are the top three countries with the highest carbon dioxide (CO2) emissions.
Fourteen out of the world's 15 most contaminated cities are in India, according to the World Health Organization. However, when measuring per capita, the three most polluting countries are located on the Arabian Peninsula due to their large share of the oil industry and small populations.
High CO2 emissions are often attributed to a country's industrial revolution period and heavy reliance on fossil fuels, such as coal, oil, and gas.
The Inflation Reduction Act in the US and the Carbon Border Adjustment Mechanism (CBAM) in Europe are examples of legislative measures aimed at reducing global emissions and promoting sustainable practices. India is also investing in renewable energy projects, such as wind farms.
