Sylvie Willis
Fossil fuels have been the primary energy source for over 150 years, and currently, they supply about 80% of the world's energy. The burning of fossil fuels releases carbon dioxide (CO2) and other greenhouse gases, which have been the largest driver of global climate change. Fossil fuel consumption has increased significantly over the past few centuries, with a roughly eightfold increase since 1950 and a doubling since 1980. Despite a shift from coal towards oil and gas, the overall consumption of fossil fuels continues to rise, with oil and gas experiencing the most growth. The transition to cleaner energy sources is imperative to mitigate the health and environmental impacts of burning fossil fuels.
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What You'll Learn
Fossil fuel consumption by country
Fossil fuel consumption varies significantly by country, with some countries consuming far more fossil fuels per capita than others. Despite a global shift towards renewable energy sources, fossil fuels remain the primary energy source in many countries. Here is a breakdown of fossil fuel consumption by country:
United States
The United States is one of the largest consumers of fossil fuels globally. In 2022, the US consumed over 19.1 million barrels of oil per day and 32.2 trillion cubic feet of natural gas. The US also consumed 76 exajoules of fossil fuels in 2023, contributing to nearly half of global fossil fuel consumption, alongside China.
China
China is a significant consumer of fossil fuels, particularly coal. In 2023, China consumed 140 exajoules of fossil fuels, with coal consumption accounting for 56% of global consumption. China's fossil fuel consumption, driven by increased coal and oil use, has contributed to record-high global fossil fuel consumption in recent years.
India
India is another major consumer of fossil fuels, ranking third globally in 2023. India's coal consumption has been surging, surpassing the combined total consumption of Europe and North America in 2023. India's fossil fuel consumption contributes to a significant portion of global energy demand.
Other Countries
Several other countries have notable fossil fuel consumption rates. For instance, Japan, with a relatively small territory, ranks fifth in global fossil fuel consumption. In 2022, Japan consumed over 151 million metric tons of oil and imported 180.3 million tons of coal. Korea is also a significant oil consumer, importing 960 million barrels of crude oil in 2021, and being the third-largest LNG importer globally. Canada, with its reliance on oil for transportation and industrial sectors, consumed upwards of 98 million metric tons of oil in 2022, along with considerable coal and gas consumption.
It is worth noting that some countries with lower overall consumption have high per capita fossil fuel consumption rates. For example, Equatorial Guinea, Estonia, Singapore, and Qatar are among the countries with per capita consumption of over 10 tons of fossil fuels per person.
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The environmental impact of burning fossil fuels
Fossil fuels have been important to human development, providing energy for cooking, heating, lighting, and powering engines. However, the environmental impact of burning fossil fuels is significant and contributes to climate change and health issues.
The burning of fossil fuels releases large amounts of carbon dioxide (CO2), a greenhouse gas that traps heat in the Earth's atmosphere. In 2022, over 70% of greenhouse gas emissions from human activities were carbon dioxide released from burning fossil fuels. This has led to an increase in global temperatures, with an average rise of 1°C already observed. As a result, the melting of glaciers and land-based ice sheets has accelerated, causing global sea levels to rise. The rising sea levels have, in turn, led to more frequent flooding, destructive storm surges, and saltwater intrusion, impacting coastal communities and ecosystems.
In addition to carbon dioxide emissions, the burning of fossil fuels also releases nitrogen oxides and radioactive materials, such as uranium and thorium, into the atmosphere. These emissions contribute to the formation of smog and acid rain, affecting air quality and the health of both humans and ecosystems. The health impacts of air pollution from fossil fuels include asthma, cancer, heart disease, and premature death. Globally, fossil fuel pollution is responsible for one in five deaths, with certain communities, such as communities of color and low-income communities, being disproportionately affected.
The extraction and distribution of fossil fuels also have environmental consequences. For example, coal mining methods, such as mountaintop removal and strip mining, can cause significant ecological damage. Offshore oil drilling poses hazards to aquatic life, and oil spills have had devastating impacts on marine ecosystems.
To mitigate these environmental impacts, a transition towards low-carbon energy sources and renewable energy is necessary. While some fossil fuel companies have recognized the need for change, there is still a significant gap between their advertising and their actual investment in renewable energy sources. Global agreements, such as the Paris Agreement, have been signed to reduce carbon emissions, but more action is required to meet the targets and limit the environmental damage caused by burning fossil fuels.
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The health impact of burning fossil fuels
Burning fossil fuels has a significant impact on human health, contributing to a range of issues and diseases. Fossil fuel combustion releases various harmful substances into the atmosphere, including nitrogen oxides, ammonia, soot, sulfur dioxide, and greenhouse gases such as carbon dioxide (CO2) and nitrous oxide (N2O). These emissions have both direct and indirect effects on human health.
The direct health impacts of burning fossil fuels are largely due to the inhalation of harmful pollutants. This can lead to respiratory illnesses, such as asthma, and other chronic respiratory diseases. Additionally, the combustion of gasoline additives like benzene and toluene produces ultra-fine particles and aromatic hydrocarbons, which are known carcinogens. Exposure to these pollutants can increase the risk of cancer and heart disease. Globally, fossil fuel pollution is a significant contributor to premature deaths, with one in five deaths attributed to it. In the United States alone, 350,000 premature deaths in 2018 were linked to fossil fuel-related pollution, with certain states, such as Pennsylvania, Ohio, and West Virginia, experiencing higher rates.
The indirect health impacts of burning fossil fuels are often related to climate change and environmental degradation. The release of greenhouse gases, particularly carbon dioxide, contributes to the greenhouse effect, leading to global warming and climate change. This, in turn, results in more frequent and severe extreme weather events, including heat waves, wildfires, hurricanes, wind storms, flooding, and droughts. These events can have devastating consequences for human health, as evidenced by the billions of dollars in economic costs and thousands of deaths attributed to exposure to wildfire smoke pollution over a 15-year period. Additionally, climate change can exacerbate existing health issues and create new challenges for healthcare systems, especially in vulnerable communities.
Children are particularly vulnerable to the health impacts of burning fossil fuels. Exposure to air pollutants and climate change during early development can lead to stunted growth, cognitive impairments, and behavioural issues. The combustion of fossil fuels can also result in malnutrition, early adversity, and toxic stress, further impacting children's learning, behaviour, and physical and mental health. These effects can have transgenerational impacts, potentially altering epigenetic marks in newborns and affecting disease pathways.
The health consequences of burning fossil fuels disproportionately affect certain communities, especially low-income communities and communities of colour. For example, Black and Hispanic Americans are exposed to significantly higher levels of particulate matter pollution than the average population. Additionally, environmental injustice results in a heavier health burden for vulnerable groups, including children, the poor, and minorities, particularly in developing countries. These inequalities further emphasize the need for equitable climate policies and interventions that prioritize public health and protect vulnerable populations from the detrimental effects of fossil fuel combustion.
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Fossil fuel reserves
Fossil fuels (coal, oil, and gas) have played a dominant role in global energy systems since the Industrial Revolution. However, they are the largest driver of global climate change and have severe health impacts due to the carbon emissions released when they are burned.
To limit global warming and mitigate their negative effects, there is a growing need to transition away from fossil fuels towards low-carbon energy sources. This involves reducing fossil fuel consumption and leaving a significant portion of fossil fuel reserves unextracted.
According to the 2015 Paris Agreement, global warming needs to be limited to well below 2 °C, with efforts to restrict the temperature increase to 1.5 °C relative to pre-industrial levels. To achieve this, a sharp decline in fossil fuel use is necessary. By 2050, nearly 60% of oil and fossil methane gas reserves, and 90% of coal reserves, must remain unextracted to stay within the 1.5 °C carbon budget. This represents a significant increase in the amount of fossil fuels that need to be left in the ground compared to the 2 °C carbon budget.
The distinction between "reserves" and "resources" is important when discussing fossil fuel reserves. Proven reserves refer to fossil fuels that can be recovered in the future with reasonable certainty, considering existing economic and technological conditions. Reserves are a fraction of resources, and our knowledge of reserves changes over time as new resources are discovered and extraction technologies advance. Therefore, the amount of reserves is not static and can increase as more resources become accessible.
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The future of fossil fuels
Fossil fuels, including coal, oil, and natural gas, have been powering economies for over 150 years and currently supply about 80% of the world's energy. However, the future of fossil fuels is uncertain as the world grapples with the need to address climate change and reduce carbon emissions.
The burning of fossil fuels releases carbon dioxide (CO2) and other greenhouse gases into the atmosphere, contributing to global climate change and local air pollution. Oil, for example, releases a significant amount of carbon when burned, accounting for about a third of the world's total carbon emissions. Natural gas, while less carbon-intensive than coal, still accounts for a fifth of global carbon emissions.
To limit global warming to 1.5°C above pre-industrial levels, as outlined in the Paris Agreement, fossil fuel emissions must be halved within a decade. This will require a rapid transition to low-carbon energy sources such as nuclear and renewables. In 2020, the COVID-19 pandemic led to a 9% decrease in U.S. fossil fuel consumption, the lowest level in nearly 30 years. This trend is expected to be temporary, with consumption projected to rebound to pre-pandemic levels.
However, the future of fossil fuels is not just about reducing emissions. Fossil fuel extraction and transportation pose significant environmental and safety risks, including oil spills and leaks from natural gas infrastructure, which can pollute oceans, wetlands, and freshwater sources. Additionally, mining operations, such as strip mining for coal, can uproot and pollute entire ecosystems.
As the world moves towards a cleaner energy future, the role of fossil fuels will likely diminish. While natural gas is projected to meet an increasing share of energy demand in the near term, particularly in the industrial sector, the long-term outlook for fossil fuels is uncertain. The development and adoption of cleaner technologies, such as renewable energy coupled with energy storage and improved energy efficiency, will be crucial in reducing our reliance on fossil fuels and mitigating their impact on the environment and human health.
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Frequently asked questions
The world burns about 80% of its energy from fossil fuels, including coal, oil, and gas.
To avoid climate catastrophe, about 80% of the world's fossil fuel reserves must stay in the ground.
The US burns fossil fuels for about 80% of its energy needs. In 2020, the US produced and consumed about a quarter of the world's natural gas.
Burning fossil fuels releases greenhouse gases, such as carbon dioxide and nitrous oxide, into the atmosphere, contributing to global warming and climate change. It also releases toxic air pollutants, such as benzene and formaldehyde, which have been linked to adverse health effects, including cancer and blood disorders.
