Rajan Wilcox
Fossil fuels are a major contributor to global climate change, accounting for a significant portion of greenhouse gas emissions. The burning of fossil fuels, such as coal, oil, and natural gas, releases carbon dioxide (CO2) and other greenhouse gases into the atmosphere, leading to the greenhouse effect. This effect traps heat and raises the Earth's average temperature, resulting in global warming. In the United States, human-caused greenhouse gas emissions are predominantly linked to the burning of fossil fuels for energy use, with transportation being a significant contributor. While natural gas produces less CO2 compared to other fossil fuels, it still contributes to overall emissions. The impact of fossil fuel combustion extends beyond climate change, as it also emits pollutants that degrade air quality and pose risks to human and environmental health.
| Characteristics | Values |
|---|---|
| Fossil fuels | Coal, oil, natural gas, and petroleum |
| Percentage of global CO2 emissions from fossil fuels | 89% in 2018 |
| Fossil fuel with the highest carbon emissions | Coal |
| Fossil fuel with the second-highest carbon emissions | Oil |
| Fossil fuel with the third-highest carbon emissions | Natural gas |
| Percentage of U.S. energy consumption by fossil fuel type in 2023 | Petroleum (38%), natural gas (36%), coal (9%) |
| Percentage of total annual U.S. energy-related CO2 emissions by fossil fuel type in 2023 | Petroleum (47%), natural gas (37%), coal (16%) |
| Greenhouse gases emitted by fossil fuels | Carbon dioxide (CO2), nitrous oxide (N2O), methane (CH4), fluorinated gases |
| Human activities responsible for the increase in greenhouse gases | Burning fossil fuels for electricity, heat, and transportation |
| Percentage of human-caused greenhouse gas emissions in the U.S. from burning fossil fuels | Approximately 74% |
| Effects of burning fossil fuels | Increasing Earth's average air temperatures, emitting pollutants that reduce air quality, contributing to climate change, causing human and environmental health problems |
| Examples of pollutants emitted by burning fossil fuels | Sulfur dioxide, nitrogen oxides, soot, and other airborne particles |
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What You'll Learn
Burning fossil fuels for electricity
The burning of fossil fuels—including oil, natural gas, and coal—is the primary cause of current climate change. In 2018, 89% of global CO2 emissions came from fossil fuels and industry. The combustion of these fuels releases greenhouse gases, carbon dioxide (CO2), and nitrous oxide (N2O) into the atmosphere, intensifying the greenhouse effect and increasing the Earth's average air temperatures.
In the United States, about 74% of human-caused greenhouse gas emissions come from burning fossil fuels for energy. In 2022, 60% of electricity in the US was generated by burning fossil fuels, mostly coal and natural gas. Worldwide, emissions of CO2 from burning fossil fuels total about 34 billion tonnes per year, with coal accounting for 45%, oil for 35%, and natural gas for 20%.
The combustion of fossil fuels for electricity production has significant environmental and health consequences. The released greenhouse gases can remain in the atmosphere for decades to centuries, contributing to long-term global warming. While natural gas is promoted as a cleaner energy source compared to coal and oil, it is still a fossil fuel, contributing to a fifth of the world's carbon emissions.
To address the issue of CO2 emissions from power stations, there have been proposals for carbon capture and storage (CCS) technologies. However, effective capture of CO2 from power stations is challenging and expensive, and there has been little progress in demonstrating its technical feasibility.
Overall, the burning of fossil fuels for electricity is a significant contributor to greenhouse gas emissions, with coal, natural gas, and petroleum being the primary sources. The transition to renewable energy sources is crucial to mitigate the environmental and health impacts of fossil fuel combustion.
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Fossil fuels used for transport
Fossil fuels are responsible for a significant proportion of greenhouse gas emissions. In the United States, about 74% of human-caused greenhouse gas emissions come from burning fossil fuels. The transportation sector is the largest source of direct greenhouse gas emissions. Over 94% of the fuel used for transportation is petroleum-based, including gasoline and diesel, which results in direct emissions. Gasoline is the dominant transportation fuel in the US, used in cars, motorcycles, light trucks, and boats. Aviation gasoline is used in aeroplanes. Distillate fuels, which are mostly diesel, are used by trucks, buses, trains, boats, and ships. Jet fuel is used in jet planes and helicopters, and residual fuel oil is used in ships.
Petroleum products are made from crude oil and natural gas processing. In 2023, petroleum products accounted for about 89% of the total US transportation sector energy use. Biofuels contributed about 6%, most of which were blended with petroleum fuels. Natural gas accounted for about 5%, mainly used as a fuel for natural gas pipeline compressors.
The US has made progress towards decarbonising transport, with policies designed to accelerate the adoption of electric vehicles, biofuels, synthetic fuels, and hydrogen. However, the transportation sector still relies heavily on fossil fuels, with motorised transport on land, sea, and air dependent on internal combustion engines that run on fossil fuels. Transport accounts for more than a third of CO2 emissions from end-use sectors. To meet net-zero targets, policies must encourage a shift to less carbon-intensive travel options, such as walking, cycling, and public transport, as well as more efficient technologies like electric vehicles.
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Coal is the dirtiest fossil fuel
Greenhouse gases are gases that trap heat and make the planet warmer. The burning of fossil fuels for electricity, heat, and transportation is the largest source of greenhouse gas emissions from human activities. Fossil fuel companies remain huge polluters, producing and selling fossil fuel products while scientists advocate for a mass switch to renewable energy and efficiency.
Coal is a fossil fuel and is the dirtiest of them all. It is a solid, carbon-heavy rock that comes in four main varieties: lignite, sub-bituminous, bituminous, and anthracite. Coal is the most carbon-intensive fossil fuel we can burn. It emits much more greenhouse gas than other sources—more than a hundred times more than nuclear. In 2023, coal accounted for about 9% of US energy consumption and about 16% of total annual energy-related CO2 emissions. Coal is responsible for over 0.3 degrees Celsius of the 1-degree Celsius increase in global average temperatures, making it the single largest source of global temperature rise.
The extraction of coal through underground mining and surface mining (strip mining) also takes a toll on the environment. Strip mining, for example, involves removing entire layers of soil and rock to access coal deposits, destroying critical wildlife habitats and causing environmental degradation that may never be restored.
To address the issue of coal being the dirtiest fossil fuel and to mitigate its environmental impact, a transition away from fossil fuels to nuclear and renewable energy sources is necessary. This transition will not only help combat climate change but also bring significant health benefits for current and future generations.
In summary, coal is the dirtiest fossil fuel due to its high carbon content and the extensive greenhouse gas emissions associated with its combustion. The extraction processes and environmental degradation caused by coal mining further emphasize the need for a shift towards cleaner and safer energy alternatives.
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Oil releases a huge amount of carbon
Greenhouse gases trap heat in the atmosphere, causing the planet to warm. Human activities are responsible for almost all of the increase in greenhouse gases over the last 150 years, with the burning of fossil fuels being the largest source of these emissions. Fossil fuels include coal, natural gas, and petroleum, which are burned to produce energy.
Oil, or petroleum, is a significant contributor to greenhouse gas emissions. When burned, oil releases a large amount of carbon—approximately a third of the world's total carbon emissions. This is due to the carbon-rich deposits that are extracted and burned for energy. Oil production itself also emits large amounts of greenhouse gases, with nearly 9,000 oil fields in 90 countries producing greenhouse gases equivalent to 1.7 gigatons of carbon dioxide in 2015. This accounts for about 5% of all emissions from fuel combustion that year.
The carbon intensity of oil production varies depending on the country and its practices. For example, Algeria, which produces the lightest crude oil, has the highest carbon intensity due to the routine burning of large amounts of gas. On the other hand, Saudi Arabia has relatively low carbon intensity because it flares less gas and has low-water content resources, requiring less energy for treatment and separation.
The transportation sector is the largest source of direct greenhouse gas emissions from petroleum-based fuels, primarily gasoline and diesel. Petroleum accounted for about 38% of U.S. energy consumption in 2023 but was responsible for 47% of total annual U.S. energy-related CO2 emissions. Oil spills also have a devastating impact on the ocean ecosystem, further exacerbating the environmental consequences of oil use.
To address the issue of greenhouse gas emissions, the Intergovernmental Panel on Climate Change (IPCC) has warned that fossil fuel emissions must be halved within 11 years to limit global warming to 1.5°C above pre-industrial levels. The transition to renewable energy sources and the reduction of oil consumption are crucial steps in mitigating the climate impact of oil and other fossil fuels.
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Natural gas is cleaner than coal and oil
Greenhouse gases trap heat and make the planet warmer. Human activities, such as burning fossil fuels, are responsible for almost all of the increase in greenhouse gases in the atmosphere over the last 150 years. Fossil fuel companies remain huge polluters, producing and selling fossil fuel products. The largest source of greenhouse gas emissions from human activities in the United States is from burning fossil fuels for electricity, heat, and transportation. In 2022, 60% of electricity in the US came from burning fossil fuels, mostly coal and natural gas.
Natural gas is often promoted as a cleaner energy source than coal and oil. This is because burning natural gas produces fewer conventional air pollutants, like sulfur dioxide and particulates, than burning coal or oil. It also produces less carbon dioxide per unit of energy – about half compared to the best coal technology. However, natural gas is still a fossil fuel and accounts for a fifth of the world’s total carbon emissions.
Natural gas is mostly methane (CH4), which has a high hydrogen content. This means that burning natural gas produces less CO2 for the same amount of heat produced from burning other fossil fuels. For example, for the same amount of energy produced, burning natural gas produces about half the CO2 that burning coal produces. In 2023, coal accounted for about 9% of US energy consumption and for about 16% of total annual energy-related CO2 emissions. Natural gas accounted for about 36% of US energy consumption and about 37% of total annual energy-related CO2 emissions.
However, there is a lack of empirically verified measurement data in the natural gas industry. Methane is a powerful greenhouse gas, about 84 times more potent than carbon dioxide over a 20-year period. Methane emissions from natural gas facilities have been found to be much higher than previously estimated. In 2021, methane emissions from natural gas and petroleum systems and abandoned oil and gas wells were the source of about 33% of total US emissions. While natural gas is often considered cleaner than coal and oil, it still contributes significantly to global warming.
The debate over whether liquefied natural gas (LNG) is cleaner than coal is contentious. LNG has been found to emit 32% less than coal when used for power generation. However, LNG emissions were 4% higher than coal when used as a substitute for industrial heat in the short term. While LNG may reduce planet-warming emissions in some instances, it likely contributes more to planetary warming than previously thought. Overall, natural gas is generally considered cleaner than coal and oil in terms of conventional air pollutants and carbon dioxide emissions. However, when considering methane emissions, the comparison becomes more complicated, and regulatory measures are crucial to ensure responsible natural gas use.
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Frequently asked questions
Fossil fuels are fuels made from the remains of dead plants and animals. Coal, oil, and natural gas are fossil fuels.
Burning fossil fuels releases greenhouse gases, such as carbon dioxide and nitrous oxide, into the atmosphere. These gases trap heat and make the planet warmer, contributing to global warming and climate change.
The largest sources of greenhouse gas emissions are electricity production, transportation, industry, agriculture, and forestry.
Fossil fuels are the largest contributor to climate change, accounting for over 75% of global greenhouse gas emissions. The burning of fossil fuels releases greenhouse gases, which trap heat and increase the Earth's average air temperatures.
