Meghan Hodges
The burning of fossil fuels has had a devastating impact on the environment, contributing to climate change and global warming. The world's most polluting industries are those that emit the most greenhouse gases, which trap heat in the atmosphere and cause global warming. The fossil fuel sector is the most polluting industry in the world, with emissions continuing to rise. In 2022, CO2 emissions from fossil fuel combustion increased by 8% compared to 2020, with coal and natural gas being the most significant contributors. While natural gas is considered the cleanest fossil fuel in terms of power plant emissions, leaks in natural gas pipelines can significantly contribute to greenhouse gas emissions. Coal, on the other hand, is the most carbon-intensive fossil fuel, and its mining and extraction processes have severe environmental and health impacts. Oil, though not widely used in power generation, is the most common fuel for transportation, making the transport sector the largest source of carbon pollution in the US.
| Characteristics | Values |
|---|---|
| Fossil fuel that makes the most pollution | Coal |
| Percentage of global energy supplied by fossil fuels | 80% |
| Fossil fuel emissions as a percentage of global CO2 emissions in 2018 | 89% |
| Increase in global average temperatures due to coal | Over 0.3°C |
| Fossil fuel pollution-related deaths in 2018 | 8 million |
| Fossil fuel pollution-related deaths in the US | 350,000 |
| Fossil fuel pollution-related deaths in China and India | 5 million |
| Fossil fuel pollution-related deaths in Europe, Southeast Asia, and parts of the US Northeast and Midwest | N/A |
| Fossil fuel emissions as a percentage of total US greenhouse gas emissions in 2022 | 60% |
| US fossil fuel emissions increase in 2022 compared to 2021 | 1% |
| US fossil fuel CO2 emissions increase in 2022 compared to 2020 | 8% |
| US coal consumption CO2 emissions decrease in 2022 compared to 2021 | 6% |
| US natural gas consumption CO2 emissions increase in 2022 compared to 2021 | 5% |
| China's decrease in PM 2.5 emissions from fossil fuels between 2012 and 2018 | 44% |
| Percentage of US energy needs supplied by gas | 38% |
| GHG emissions from transportation of merchandise | 40% |
| GHG emissions from passenger travel | 60% |
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What You'll Learn
Coal is the dirtiest fossil fuel
Fossil fuels are formed from the decomposition of carbon-based organisms that died and were buried millions of years ago. They are non-renewable and currently supply around 80% of the world’s energy. The three types of fossil fuels are coal, oil, and natural gas.
The extraction of coal also has a significant environmental impact. Underground mining uses heavy machinery to cut coal from deep underground deposits, while surface mining (also known as strip mining) removes entire layers of soil and rock to access coal deposits. Strip mining accounts for about two-thirds of coal sourced in the United States. This process destroys critical wildlife habitats and forces animals to compete with existing wildlife for resources in less-than-ideal habitats.
The burning of fossil fuels has been linked to a high number of premature deaths worldwide. A study by Harvard University found that more than 8 million people died in 2018 from fossil fuel pollution, with air pollution from burning fossil fuels responsible for about one in five deaths worldwide. China lowered its fossil fuel PM 2.5 emissions by about 44% between 2012 and 2018, saving around 1.5 million lives each year.
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Oil releases a lot of carbon when burned
Fossil fuels are non-renewable energy sources formed from the decomposition of carbon-based organisms that died and were buried millions of years ago. There are three types of fossil fuels: coal, oil, and natural gas. When burned, these fossil fuels release energy in the form of heat, which is used for power generation, transportation, and other industrial processes. However, the burning of fossil fuels also contributes significantly to pollution and climate change.
Oil, in particular, releases a large amount of carbon when burned, accounting for approximately one-third of the world's total carbon emissions. This is because the amount of carbon dioxide (CO2) produced when a fuel is burned is directly related to its carbon content, and oil has a higher carbon intensity than natural gas. While natural gas is primarily methane (CH4), which has a higher energy content and lower carbon dioxide emissions relative to its energy output, oil combustion releases significant amounts of CO2, contributing to its high carbon emissions.
The combustion of oil leads to the release of various waste products and pollutants, including carbon dioxide, carbon monoxide, sulphur dioxide, and nitrogen oxides. These emissions have detrimental effects on the environment and human health. Carbon dioxide, a greenhouse gas, contributes to global warming and climate change. Sulphur dioxide and nitrogen oxides are also harmful pollutants that can lead to the formation of smog and acid rain.
The impact of oil combustion on human health cannot be overlooked. Fossil fuel pollution has been linked to approximately 8 million premature deaths worldwide in 2018, according to research by Harvard University and other institutions. This figure may even be an underestimate, as it does not include long-term exposure to ozone air pollution or smog, which are also driven by fossil fuel combustion. Children are particularly vulnerable, with respiratory infections attributed to fossil fuel pollution being a leading cause of death in those under five years of age.
To address the environmental and health consequences of oil combustion, a transition to cleaner energy sources and improved technologies is necessary. Reducing and controlling emissions from the use of internal combustion engines, which contribute significantly to pollution, is essential. Additionally, implementing building design and energy efficiency measures can help decrease the overall demand for fossil fuels, including oil, and mitigate their harmful impacts on the planet and human health.
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Fossil fuel air pollution kills one in five people
Fossil fuels are formed from the decomposition of carbon-based organisms that died millions of years ago. They are non-renewable and currently supply around 80% of the world’s energy. The three types of fossil fuels are coal, oil, and gas.
Burning fossil fuels releases harmful pollutants into the atmosphere, which have been linked to a staggering number of deaths worldwide. According to research, air pollution from fossil fuels is responsible for approximately one in five deaths globally, with an estimated 8.7 million premature deaths each year. This figure is more than twice the previous estimate of 4.2 million deaths in 2015. The actual number of deaths may even be higher, as the estimate does not include those caused by long-term exposure to ozone air pollution or smog, which are also driven by the combustion of fossil fuels.
The burning of coal, gasoline, and diesel releases significant quantities of PM 2.5, including soot and other fine particles laden with toxins. These particles are small enough to penetrate deep into the lungs, aggravating respiratory conditions like asthma and leading to serious health issues such as lung cancer, coronary heart disease, and strokes. The impact of fossil fuel pollution is particularly severe in regions with high concentrations of air pollution, including Eastern North America, Europe, and South-East Asia, which have the highest rates of mortality attributed to air pollution.
The health consequences of fossil fuel combustion are significant, and the transition to cleaner energy sources can have tangible benefits. For example, China's efforts to reduce PM 2.5 emissions by 44% between 2012 and 2018 have resulted in saving around 1.5 million lives annually. The health gains from reducing fossil fuel emissions are substantial, as highlighted by Dr. Aaron Bernstein, who stated, "The health gains we can achieve from getting off fossil fuels is twice what we thought it was yesterday."
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Fossil fuel emissions are rising
Fossil fuels—coal, oil, and gas—are the dominant cause of global warming. In 2018, 89% of global CO2 emissions came from fossil fuels and industry. Despite the urgent need to transition to renewable energy, fossil fuel emissions are rising.
In 2022, US greenhouse gas emissions increased by 0.2% compared to 2021 levels. This rise was driven by a rebound in economic activity after the height of the COVID-19 pandemic. Fossil fuel combustion played a significant role, with CO2 emissions from this source increasing by 8% relative to 2020 and 1% relative to 2021. While coal consumption decreased by 6% from 2021, natural gas consumption increased by 5% in the same period. The transportation sector, which relies heavily on petroleum-based fuels, is the largest source of direct greenhouse gas emissions. The industrial sector, which burns fossil fuels for energy, is another major contributor to emissions.
The health impact of fossil fuel emissions is devastating, with air pollution from burning fossil fuels responsible for about one in five deaths worldwide. In 2018, more than 8 million people died from fossil fuel pollution, according to research by Harvard University and other institutions. This figure is significantly higher than previously estimated, and the true toll may be even higher when including deaths from long-term exposure to ozone pollution and smog, also driven by fossil fuel combustion.
While renewable energy projects are becoming more widespread and cost-effective, investments in electricity grids are not keeping pace with generation. For every $1 invested in generation, only about 60 cents goes into national grids. This imbalance could hinder the transition to cleaner energy sources and slow down efforts to curb rising fossil fuel emissions.
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Transport is responsible for one-fifth of GHG emissions
Fossil fuels are the dominant cause of global warming, with 89% of global CO2 emissions in 2018 coming from their use. Coal is the most polluting fossil fuel, responsible for over 0.3 degrees Celsius of the 1-degree increase in global average temperatures. Oil is a close second, with approximately one-third of the world's total carbon emissions being released when it is burned.
The burning of fossil fuels for electricity, heat, and transportation is the largest source of greenhouse gas emissions from human activities in the United States. In 2022, the transportation sector was the largest contributor to direct greenhouse gas emissions in the US, accounting for 28% of total US GHG emissions. This is largely due to the burning of petroleum-based fuels, such as gasoline and diesel, for cars, trucks, ships, trains, and planes.
Transportation is also a major contributor to global carbon dioxide emissions, accounting for around one-fifth of global CO2 emissions. This figure rises to 24% when only considering CO2 emissions from energy. Road travel accounts for three-quarters of transport emissions, with passenger vehicles contributing 45.1% and trucks 29.4%. As transport demand is expected to increase worldwide in the coming decades, it is likely that transport emissions will also rise.
The health impacts of fossil fuel pollution are significant. A study by Harvard University and other institutions found that more than 8 million people died in 2018 from fossil fuel pollution, with air pollution from burning fossil fuels responsible for about one-fifth of deaths worldwide. This figure includes the thousands of children under the age of five who die each year from respiratory infections attributed to fossil fuel pollution. Fossil fuel pollution has also been linked to increased rates of lower-respiratory infections in children under five in higher-income countries in Europe and North and South America.
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Frequently asked questions
The fossil fuel sector as a whole is the most polluting industry in the world. However, coal is the most carbon-intensive fossil fuel we can burn in terms of emissions.
Fossil fuels have caused air and water pollution, as well as global warming. They have also been linked to health issues such as asthma, bronchitis, and certain cancers.
Fossil fuels are formed from the fossilized remains of plants and animals that lived millions of years ago. They have a high carbon content and are burned for energy.
Coal, crude oil, and natural gas are all examples of fossil fuels.
The use of renewable energy sources such as wind and solar power can help reduce pollution from fossil fuels. Regulatory changes and initiatives such as carbon credits can also contribute to reducing emissions.
