Sylvie Willis
Fossil fuels are responsible for a significant amount of global carbon dioxide emissions, with worldwide emissions from burning fossil fuels totalling about 34 billion tonnes per year. In 2022, global carbon dioxide emissions from fossil fuels hit a record high of 36.6 billion tonnes, driven by a strong increase in oil emissions as global travel recovered from the Covid-19 pandemic. The burning of fossil fuels, such as coal, oil, and natural gas, releases greenhouse gases, primarily carbon dioxide, into the atmosphere, contributing to global warming and climate change. The transportation sector, including cars, trucks, ships, trains, and planes, is the largest source of direct greenhouse gas emissions, with over 94% of its fuel coming from petroleum-based sources. Despite some progress in reducing emissions, the continued rise in emissions from fossil fuels impedes efforts to limit global warming and meet climate goals.
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What You'll Learn
Fossil fuel emissions in the US
Fossil fuels, including coal, oil, and natural gas, have been the primary energy source for over 150 years. In 2020, oil was the largest source of US energy-related carbon emissions, with natural gas a close second. The transportation sector is the largest source of direct greenhouse gas emissions in the US, and the second-largest source when indirect emissions from electricity end-use are considered. In 2023, the transportation sector accounted for the largest share of US energy end-use CO2 emissions due to its near-complete dependence on petroleum fuels.
In 2022, fossil fuel combustion was responsible for about 74% of total US human-caused (anthropogenic) greenhouse gas emissions. The burning of fossil fuels accounted for 93% of total US anthropogenic CO2 emissions. In 2023, carbon dioxide emissions from fossil fuels rose again, reaching record levels. According to estimates, emissions rose by 1.1% in 2023 compared to 2022, bringing total fossil fuel emissions to 36.8 billion metric tons of carbon dioxide.
The US has made significant progress in transitioning to renewable energy sources and improving energy efficiency over the past decade. Federal, state, and local policies have helped grow the clean energy economy, and new regulations from the EPA have strengthened rules limiting mercury and air toxic pollutants from power plants. However, coal-fired power plants continue to be a major source of emissions, generating 35% of dangerous mercury emissions in the US, along with two-thirds of sulfur dioxide emissions and most soot in the air.
Natural gas, while less carbon-intensive than other fossil fuels, is not without its drawbacks. In 2020, it was responsible for 36% of US greenhouse gas emissions due to leakage and direct emissions from combustion. Despite a projected increase in natural gas usage due to its low price, the US is transitioning to renewable energy sources such as hydropower, biomass, wind, geothermal, and solar energy.
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Fossil fuel emissions in China
Fossil fuels are the primary source of energy-related carbon dioxide emissions. In 2023, the worldwide emissions of carbon dioxide from burning fossil fuels totalled about 36.8 billion metric tons. The transportation sector, which is almost entirely dependent on petroleum fuels, is responsible for the largest share of these emissions.
China, the largest emitter of CO2 annually since 2006, accounted for 35% of global CO2 emissions in 2023. China's per capita emissions are over the world average, at 10.1 tonnes of CO2 emitted per person each year. China's total historical greenhouse gas emissions surpassed those of the European Union in 2024 but are still lower than those of the United States. China emitted over 12.6 gigatonnes of greenhouse gases in 2023, 35% of the world total.
China has implemented policies to mitigate climate change, such as the National Plan for Tackling Climate Change, which includes prevention, adaptation, scientific study, and public awareness. The plan aimed to reduce China's high energy consumption per unit of GDP and encourage more productive, self-sufficient, renewable, and creative energy production and consumption. China has also committed to the Paris Agreement, pledging to peak emissions by 2030 and achieve net-zero emissions by 2060.
Despite these efforts, China is not on track to meet its emission reduction targets under its 14th Five-Year Plan for 2025 and its 2030 NDC commitment under the Paris Agreement. China's dependency on fossil fuels and high emission levels are expected to continue, with rising energy consumption projected to grow by over 10% by 2030. China's suite of sectoral 14th Five-Year Plans includes measures to prepare for a post-coal transition, but these are insufficient to counter growing energy demand and reduce fossil fuel dependence.
To align emissions with its 2060 carbon neutrality goal, China needs to integrate clear targets for coal consumption reduction in its updated NDC and the 15th Five-Year Plan. China is the global leader in the energy transition supply chain, manufacturing most of the world's solar panels, wind turbines, electric vehicles, and batteries. Investment in clean energy technologies contributed over 10% of China's GDP in 2024, totalling USD 1.9 trillion.
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Fossil fuel emissions in India
Fossil fuels are a major contributor to global carbon dioxide emissions, with worldwide emissions from burning fossil fuels totalling about 34 billion tonnes per year. The burning of fossil fuels has been responsible for 74% of total US greenhouse gas emissions and 93% of total US anthropogenic carbon dioxide emissions.
India, the world's second-largest coal consumer, has seen a rapid expansion of renewables in recent years. In 2017, renewable investment and new capacity surpassed fossil fuels for the first time. However, India's fossil fuel demand remains unchanged, with coal production and imports reaching record highs in 2024 to meet rising electricity demands. India's carbon dioxide emissions from fossil fuel use and industrial purposes increased by 7.8% in 2023, reaching a new record high of 2.9 billion metric tons. The country's annual fossil carbon dioxide emissions have nearly tripled since the turn of the century due to rapid economic development.
India has taken steps towards decarbonisation, such as advancing its green hydrogen policy and setting a target of five million tonnes per annum of green hydrogen production by 2030. Additionally, India has committed to transitioning to 100% electric vehicles, particularly two and three-wheelers.
In terms of renewable energy, India set a goal in 2015 to install 175 GW of renewable energy capacity by 2022, consisting of 100 GW solar, 60 GW onshore wind, 10 GW bioenergy, and 5 GW small hydro. As of 2018, India's total current capacity, including fossil fuel and low-carbon plants, is around 350 GW, with renewables reaching 72 GW. India's power minister, Raj Kumar Singh, expressed the country's hope to reach 225 GW of renewables by 2022.
While India's renewable energy sector is growing, its current policies and actions have been rated as "Insufficient" compared to its fair share contribution to emission reductions. The country will need international support to align with the 1.5-degree Celsius target of the Paris Agreement.
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Fossil fuel emissions in the EU
Fossil fuels are a major contributor to global carbon dioxide (CO2) emissions, which have climbed to record highs in recent years. In 2023, worldwide emissions of CO2 from burning fossil fuels reached approximately 36.8 billion metric tons, according to estimates. The transportation sector, which relies heavily on petroleum fuels, is the largest contributor to these emissions.
In the context of the EU, fossil fuel emissions have been a significant concern, and the EU has committed to addressing this issue. In 2022, the EU's CO2 emissions from fossil fuel combustion (including oil, natural gas, coal, and peat) for energy use in the EU territory reached almost 2.4 gigatons, indicating a 2.8% decrease compared to 2021. Germany accounted for the highest proportion, contributing about one-quarter of the EU's total CO2 emissions from fossil fuel combustion. Italy, Poland, and France were also among the top emitters, each accounting for 12.4%, 12.4%, and 10.7%, respectively.
While there was a slight increase in emissions from solid fossil fuels like coal and oil shale in the EU, emissions from natural gas decreased significantly in 2022, reflecting the bloc's efforts to reduce gas demand. Additionally, in 2022, 17 EU countries witnessed a decrease in CO2 emissions from territorial energy use, with the Netherlands, Luxembourg, Belgium, and Hungary leading the way.
Despite these efforts, the EU recognizes the urgency of more substantial emission reductions. In October 2023, the EU Environment and Climate Ministers approved Council Conclusions ahead of COP28, emphasizing the need for a global phase-out of unabated fossil fuels from the energy sector well ahead of 2050. The EU aims to achieve net-zero emissions no later than 2040, with intermediate targets of -65% gross or -76% net emission cuts by 2030.
To summarize, while the EU has shown progress in reducing fossil fuel emissions, primarily in the energy sector, it has also acknowledged the necessity of accelerated action. The bloc's commitment to a global phase-out of unabated fossil fuels and its ambitious emission reduction targets demonstrate its recognition of the climate crisis's severity.
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Fossil fuel emissions and carbon capture
Fossil fuels are a major contributor to global carbon dioxide (CO2) emissions, which have significant environmental and health impacts. Worldwide emissions of CO2 from burning fossil fuels are approximately 34 billion tonnes per year, with coal, oil, and gas being the primary sources. The transportation sector, heavily reliant on petroleum fuels, is the largest contributor to energy-end use CO2 emissions.
The continued rise in emissions from fossil fuel burning is impeding progress in mitigating global warming. To address this, there have been proposals for carbon capture and storage (CCS) technologies. CCS involves capturing CO2 emissions from power plants and industrial facilities, transporting them, and storing them deep underground in geological formations, such as saline aquifers or depleted oil and gas reservoirs. While CCS has been operational in the US since 1972, capturing over 200 million tons of CO2, it has limitations. The process is expensive, and capturing CO2 from power stations is challenging. Additionally, CCS does not address other harmful pollutants, and its deployment may prolong the use of fossil fuels, delaying the transition to clean energy sources.
Despite the challenges, CCS is viewed as a potential solution to reduce CO2 emissions and mitigate global warming. The Intergovernmental Panel on Climate Change (IPCC) emphasizes that achieving the goals of the Paris Agreement, which aims to limit temperature increases to 1.5°C, requires more than just reducing emissions. However, critics argue that a massive buildout of CCS facilities is not the answer to the climate crisis. It is essential to transition to a zero-emissions, clean energy economy and ensure environmental justice for communities affected by fossil fuel pollution.
While CCS may have limited short-term applications in reducing emissions from hard-to-electrify industrial sectors, addressing the climate crisis requires a comprehensive approach beyond carbon capture. Prioritizing clean energy sources, such as nuclear, wind, and solar power, is crucial to reducing emissions and mitigating the impacts of climate change.
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Frequently asked questions
Worldwide emissions of carbon dioxide (CO2) from burning fossil fuels total about 34 billion tonnes per year, with estimates reaching as high as 36.8 billion metric tons.
Fossil fuels account for most energy-related CO2 emissions. In the US, burning fossil fuels accounted for 74% of total greenhouse gas emissions in 2022. Globally, fossil fuels were responsible for 93% of total anthropogenic CO2 emissions in 2022.
Coal is responsible for the most emissions, accounting for approximately 45%-40% of global fossil CO2 emissions. Oil is the second-largest contributor at 32%, followed by gas at 21%.
The burning of fossil fuels releases CO2 into the atmosphere, causing the greenhouse effect. This refers to how certain gases in the Earth's atmosphere, like CO2, trap long-wave thermal radiation, leading to a warming of the climate.
