Meghan Hodges
The world is facing a climate catastrophe, and scientists warn that time is running out to reduce the use of fossil fuels. In 2022, the top 20 global climate polluters were responsible for 83% of emissions, with China, India, the United States, and the European Union being the biggest offenders. China's CO2 output has more than tripled since 2000, and the country is responsible for nearly 30% of global emissions. The US, on the other hand, has nearly double the per capita emissions of China. India, despite being one of the world's biggest polluters, has per capita emissions significantly below the global average. Russia, Brazil, and Indonesia are also among the top ten largest contributors to CO2 emissions.
| Characteristics | Values |
|---|---|
| Countries with the highest carbon emissions | China, the United States, India, Russia, Japan, Germany, Brazil, Indonesia |
| Reasons for high emissions | Reliance on coal, oil, gasoline-fueled transportation industry, natural gas, cement and steel production |
| Climate goals | China, the US, and the EU have committed to ramping up renewable energy and reducing greenhouse gas emissions |
| Per capita emissions | The average American is responsible for nearly twice as much climate pollution as the average person in China |
| Progress | Levels of planet-heating pollution have been declining in the US and EU |
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What You'll Learn
China's CO2 output
China is the world's largest emitter of carbon dioxide, with over 14 billion tons of CO2 released as of 2024. China's CO2 emissions are primarily driven by its extensive use of coal, which accounts for about 58% of the country's total energy generation. The country is also one of the largest importers of oil, which contributes to its CO2 emissions through motor vehicle use. China's industrial production and rapid urbanization have further intensified its CO2 emissions.
However, there are signs that China's CO2 emissions may be starting to decline. In the first quarter of 2025, China's emissions were down 1.6% year-on-year, and by 1% in the latest 12 months. This decrease is attributed to the growth in clean power generation from wind, solar, and nuclear sources, which has outpaced the demand for coal power. China's hydropower has also been stable, indicating that the clean energy growth is driven by increases in solar, wind, and nuclear power capacity.
Despite this recent progress, China is still significantly off track to meet its 2030 commitment to reduce carbon intensity. Carbon intensity fell by 3.4% in 2024, but this rate of improvement is not enough to meet the 2025 and 2030 targets. China's plans to reduce its dependence on coal and increase the use of nuclear, renewable energy sources, and natural gas will be crucial in decreasing overall pollution and reducing CO2 emissions.
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India's coal usage
India is the third-largest carbon dioxide emitter in the world, with 3,062 million metric tons of total carbon dioxide emissions produced in 2023. Coal is the primary energy source for India, supplying about 44% of the country's energy. India is the second-largest producer and consumer of coal, mining 1,047 million metric tons in 2024-25. Coal has been mined in India since 1774, with commercial exploitation beginning with the East India Company. India imports around 15% of the coal it consumes, and coal-fired power plants have been criticised for breaking environmental laws.
The country's coal usage has serious health and environmental impacts, and phasing out coal would bring significant short-term benefits. India's coal usage is driven by its need for electricity, with most of the electricity generated by coal. However, electricity from new solar farms in India is now cheaper than that produced by existing coal plants.
India has taken some steps to reduce its coal consumption and transition to cleaner energy sources. The country plans to increase the natural gas market share to 15% by 2030 to reduce air pollution and use cleaner-burning fuels. In addition, the government has permitted private companies to mine coal for specific industries since 2015, breaking the monopoly held by state-owned companies since the 1950s.
Despite these efforts, India's coal usage remains high, contributing significantly to its carbon dioxide emissions. As a result, India is one of the world's largest greenhouse gas emitters, and addressing its coal consumption will be crucial in mitigating climate change.
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US fossil fuel reliance
The United States is one of the world's biggest carbon polluters, second only to China. The US's heavy reliance on fossil fuels is a significant contributor to its high pollution levels. Fossil fuels account for the largest share of US energy production and consumption. In 2019, 80% of domestic energy production and consumption in the US was from fossil fuels. This figure has decreased over time, with fossil fuels accounting for 84% of total US primary energy production in 2023, and less than 50% of electricity generated in March 2025.
The US's fossil fuel consumption includes petroleum, natural gas, and coal. The contribution of coal to total US energy consumption has declined from about 37% in 1950 to 9% in 2023. This is due to the US electric power sector increasing its use of other energy sources and reducing coal consumption. Nuclear energy production has also grown in the US since the 1950s, although it has levelled off since 2001.
Despite these changes, the US still has a heavy reliance on fossil fuels, particularly in the transportation sector. In 2023, petroleum provided about 89% of the transportation sector's primary energy consumption. The US's gasoline-fueled transportation industry is a major contributor to the country's high carbon emissions.
To address its fossil fuel reliance and reduce emissions, the US has introduced legislative measures such as the Inflation Act. This act includes provisions related to clean energy investments, tax credits for renewable projects, and initiatives to accelerate the transition to a low-carbon economy. The act aims to integrate climate-focused measures into economic policies to drive environmental sustainability alongside economic resilience.
In addition to legislative measures, the US has also invested in improving energy infrastructure and increasing the use of renewable energy sources. For example, the $1 trillion Infrastructure Investment and Jobs Act signed into law in 2021 includes funding for a network of electric vehicle charging stations and the production of clean energy. The US has also seen substantial growth in wind and solar power, with these sources generating more than half of US electricity for the first time in March 2025.
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Russia's natural gas
Russia is one of the world's top carbon polluters, ranking fourth in carbon dioxide emissions in 2023. The country emitted 1,816 million metric tons of carbon dioxide in 2023, with the primary sources being natural gas and coal. Russia has one of the world's largest natural gas deposits, and natural gas is the primary source of energy and power generation in the country.
The Russian government has encouraged the use of natural gas in various sectors. For example, the government has promoted the use of natural gas vehicles, with companies offering aftermarket conversion kits and some vehicles sold with natural gas systems. Gazprom, a state-controlled gas company, has also played a crucial role in the domestic and industrial natural gas market. The company has had its gas sale prices regulated by the government since 1991, impacting the profitability of its operations.
In recent years, Russia has sought to diversify its natural gas exports beyond Europe. In 2014, Russia and China reached an agreement for Russia to supply China with 38 billion cubic meters (bcm) of natural gas annually for 30 years. This agreement allows Russia to reduce its dependence on the European market and provides China with a cleaner energy source compared to coal. The "Power of Siberia" pipeline was commissioned in December 2019 to facilitate this agreement.
However, Russia's natural gas sector has also faced challenges, particularly regarding the extent of government subsidies. While it is difficult to estimate the exact amount, the IEA estimated gas subsidies at 42 billion USD in 2021, the largest in the world. These subsidies have likely contributed to the limited growth of renewable energy sources in Russia. Additionally, Russia's invasion of Ukraine in 2022 led to restrictions on gas supply to the European Union, further complicating the country's natural gas landscape.
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Japan's emissions
Japan has long been a major consumer and importer of energy and a recognised leader in energy technology development. It is one of the top five countries that produce the world's highest carbon dioxide (CO2) emissions, according to the most recent data from the Global Carbon Atlas. Japan's emissions are primarily driven by its extensive use of fossil fuels, particularly coal, oil, and natural gas. The burning of these fuels for power generation, transportation, and industrial processes such as making paper or steel are significant contributors to Japan's carbon footprint.
In recent years, Japan has made efforts to reduce its emissions and mitigate the impact of climate change. The country has set targets to transition to lower-carbon sources of energy, such as renewables or nuclear power. However, the trajectory of CO2 emissions in Japan and globally remains higher than what is needed to avoid the worst effects of climate change.
One important metric to monitor Japan's progress in reducing emissions is energy intensity, which refers to the amount of CO2 emitted per unit of energy. By transitioning to lower-carbon sources of energy, Japan can decrease its carbon intensity and work towards decoupling economic growth from CO2 emissions.
Another factor contributing to Japan's emissions is the production and consumption of goods. Measures of territorial-based emissions, or production-based emissions, do not account for the embedded emissions in global trade. As a highly developed country, Japan's per-capita energy-related CO2 emissions are higher than those of less economically developed nations.
To address these challenges, Japan can focus on reducing energy consumption and transitioning to lower-carbon energy sources. Additionally, Japan can support environmental projects and initiatives to offset its carbon footprint and contribute to global efforts in combating climate change.
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Frequently asked questions
The countries that produce the most carbon dioxide emissions are China, the United States, India, Russia, and Japan. China is the biggest polluter overall, with more than 14 billion tons of CO2 released annually.
China's extensive use of coal is the primary reason for its high emissions. About 58% of the country's energy comes from coal, and it is also one of the largest importers of oil. China's rapid economic growth and urbanisation have intensified its CO2 emissions.
When considering per capita emissions, the average American is responsible for nearly twice as much climate pollution as the average person in China. The US and EU have seen their emissions decline in recent years due to more ambitious climate policies.
