Sylvie Willis
Fossil fuels are carbon-based compounds formed from the decomposition of organic matter over millions of years. They are non-renewable resources that have been burned as fuel for energy, powering human activities and development. The burning of fossil fuels releases carbon dioxide, a greenhouse gas, into the atmosphere, contributing to global warming and climate change. With rising concerns about environmental and health impacts, there is a growing movement towards divestment from fossil fuels and a transition to renewable energy sources. However, fossil fuels continue to play a significant role in global energy systems, powering transportation, industrial processes, and electricity generation.
| Characteristics | Values |
|---|---|
| Definition | Flammable carbon compound- or hydrocarbon-containing material formed naturally in the Earth's crust from the buried remains of prehistoric organisms |
| Examples | Coal, petroleum, natural gas, oil, gas |
| Use Cases | Cooking, heating, lighting, powering heat engines, generating electricity, powering transportation, industrial processes |
| Impact | Global warming, climate change, environmental pollution, health issues |
| Global Action | Paris Agreement, Inflation Reduction Act, Fossil fuel divestment |
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What You'll Learn
Fossil fuels are a dominant energy source
Fossil fuels are a group of energy sources that were formed from ancient plants and organisms during the Carboniferous Period, approximately 286–360 million years ago. As these organisms died, they sank to the bottom of swamps and oceans, forming layers of a spongy material called peat. Over millions of years, the peat was converted into sedimentary rock by the pressure of sand, clay, and other minerals.
Fossil fuels have played a key role in human development, as they can be readily burned in the open atmosphere to produce heat. The use of peat as a domestic fuel predates recorded history, and coal was burned in early furnaces for the smelting of metal ores. The wide-scale use of fossil fuels, particularly coal, enabled the Industrial Revolution, and they continue to power the industrialization of nations. Fossil fuels are used for electricity production, transportation fuel, and the production of common products such as paints, detergents, polymers, cosmetics, and some medicines.
Despite their importance, fossil fuels are non-renewable resources, and their use has severe negative impacts. When burned, they produce carbon dioxide (CO2) and are the largest driver of global climate change. They are also a major contributor to local air pollution, which is linked to millions of premature deaths each year. As low-carbon sources of energy become available, the world needs to transition away from fossil fuels.
In 2023, fossil fuels provided 77% of primary energy consumption and over 60% of the electricity supply worldwide. However, there is a growing movement towards divestment from fossil fuels, with institutions totalling over $40.5 trillion in assets committing to some form of divestment as of July 2023. The gradual depletion of conventional fossil fuel reserves has also led companies to develop more challenging reserves, which often come with higher production costs and a greater risk of environmental impact.
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They are the largest contributor to climate change
The combustion of fossil fuels is the primary cause of current climate change, significantly impacting the Earth's ecosystems and causing human and environmental health issues. The burning of fossil fuels, such as oil, natural gas, and coal, releases vast amounts of carbon dioxide (CO2) and other greenhouse gases into the atmosphere. These gases trap heat, leading to global warming and altering the Earth's climate system.
Fossil fuels are formed from the decomposition of prehistoric organisms, creating carbon-rich deposits that are extracted and burned for energy. The combustion of these fossil materials returns carbon to the atmosphere as CO2 at a significantly faster rate than it was buried, disrupting the carbon cycle. The accumulation of CO2 in the atmosphere intensifies the greenhouse effect, increasing the Earth's average air temperatures.
CO2 emissions from fossil fuels have significantly increased since 1850, with the majority of this increase attributed to rising fossil fuel consumption and industrial emissions. In 2018, 89% of global CO2 emissions originated from fossil fuels and industry. Coal, a fossil fuel, is the most polluting, contributing over 0.3°C to the 1°C increase in global average temperatures. Oil combustion releases significant carbon emissions, accounting for approximately one-third of the world's total carbon emissions. Natural gas, while promoted as a cleaner alternative, is still a fossil fuel, contributing to one-fifth of global carbon emissions.
In addition to CO2, the burning of fossil fuels also releases nitrous oxide (N2O) and soot particles. N2O emissions are produced by chemical production and fossil fuel combustion, and they accumulate in the atmosphere over decades to centuries. Soot particles, when deposited on snow, increase sunlight absorption, leading to accelerated melting. These emissions contribute to global warming and have severe consequences for the environment and human health.
To address climate change, 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. This target underscores the urgent need to transition from fossil fuels to renewable energy sources and improve energy efficiency.
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Fossil fuel divestment is growing
Fossil fuel divestment is an attempt to reduce climate change by encouraging institutional divestment from assets including stocks, bonds, and financial instruments connected to companies involved in fossil fuel extraction. As of July 2023, over 1593 institutions with more than $40.5 trillion in global assets had begun or committed to some form of fossil fuel divestment. This represents a significant increase from April 2016, when 515 institutions with a total of $3.4 trillion in assets had joined the pledge.
Fossil fuel divestment campaigns first emerged on college and university campuses in the United States in 2011, with students urging their administrations to shift endowment investments from the fossil fuel industry to clean energy and communities impacted by climate change. Unity College in Maine became the first institution of higher learning to divest its endowment from fossil fuels in 2012. Since then, numerous other educational institutions have followed suit, including Cornell University, Seattle University, and the College of the Marshall Islands.
The fossil fuel divestment movement has faced criticism from some industry representatives, who argue that divesting from fossil fuels does not reduce demand and may result in environmentally conscious investors losing influence over the operations of these companies. However, proponents of divestment highlight the moral dimensions of climate change and the need to break the fossil fuel industry's hold on the economy and governments.
Financial research suggests that fossil fuel divestment has positively impacted investors' returns in the long term. Additionally, the Inflation Reduction Act seeks to reduce the United States' dependence on fossil fuels, indicating a growing recognition of the need to transition away from these energy sources. As such, fossil fuel divestment is expected to continue gaining momentum as a strategy to address climate change and mitigate financial risks associated with the industry.
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They are key to industrialisation and rising prosperity
Fossil fuels have been integral to human development and industrialisation. They are a readily available source of energy, which can be burned in the open atmosphere to produce heat. The use of peat as a domestic fuel predates recorded history, and coal was burned in early furnaces for metal ore smelting. The commercial exploitation of petroleum began in the 19th century, and natural gas is now considered a valuable resource. Oil sands and heavy crude oil have also become important sources of fossil fuels.
The Industrial Revolution, which began in the late 1700s, was enabled and accelerated by the use of fossil fuels. Coal-powered steam engines and gas lights using natural gas or coal gas were widely adopted. This marked a shift from traditional manufacturing processes that relied on agricultural energy sources to a mineral-intensive economy. Fossil fuels provided the energy needed for industrial machinery, improving efficiency and output. The development of the internal combustion engine further increased the demand for fossil fuels, as did the advent of transportation methods such as railways and aircraft.
The large-scale use of fossil fuels has had a significant environmental impact, with rising carbon emissions contributing to global warming and climate change. Despite the introduction of renewable energy sources, fossil fuels still account for around 80% of global energy consumption. This has resulted in a persistent rise in greenhouse gas emissions and global temperatures, causing far-reaching effects on ecosystems and human health.
The transition to low-carbon energy sources is essential to mitigate the impact of fossil fuels on the environment. However, fossil fuels continue to play a dominant role in global energy systems, powering transportation, industrial processes, and electricity generation. Fossil fuel consumption has increased significantly over the past decades, with a shift from coal towards a combination of oil and gas. Today, oil and gas consumption continue to grow, while coal consumption is declining in many parts of the world.
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They are formed from the decomposition of prehistoric organisms
Fossil fuels are a crucial source of energy, currently supplying around 80% of the world's energy. They are formed from the decomposition of prehistoric organisms, a process that occurs within geological formations. This process, known as anaerobic decomposition, involves the breakdown of organic matter, such as plants, algae, bacteria, and plankton, under anoxic conditions.
Over millions of years, the organic matter is subjected to high temperatures and pressure within the Earth's crust, leading to chemical alterations. The initial transformation results in the formation of a waxy substance known as kerogen, found in oil shales. With further heat and pressure, the kerogen undergoes catagenesis, converting into liquid and gaseous hydrocarbons. These hydrocarbons include crude oil, which is a mixture of thousands of different molecules, primarily composed of hydrogen and carbon. The density and composition of crude oil vary, resulting in different types such as heavy crude oil and conventional crude oil.
Plants, specifically terrestrial plants, tend to form coal and methane through this process of decomposition. Coal fields often date back to the Carboniferous period, and coal has been used for various purposes, including the smelting of metal ores and domestic heating. In contrast, plankton, including phytoplankton and zooplankton, decomposes into natural gas and oil. Natural gas deposits are also a significant source of helium.
The process of fossil fuel formation is slow, taking millions of years, and the known viable reserves are being depleted at a much faster rate than new ones are generated. This classification as non-renewable resources has led to a growing movement towards fossil fuel divestment, with institutions worldwide committing to reducing their investments in fossil fuels.
The burning of fossil fuels releases large amounts of carbon dioxide and other greenhouse gases, contributing to global warming and climate change. These emissions have far-reaching effects on ecosystems and human health, including the risk of species extinction, food scarcity, and respiratory issues. Therefore, there is an increasing focus on transitioning to renewable energy sources and reducing the combustion of fossil fuels to mitigate their impact on the environment and human well-being.
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Frequently asked questions
Fossil fuels are energy sources formed from the decomposition of carbon-based organisms that died and were compressed and heated underground millions of years ago. Examples include coal, oil and natural gas.
Fossil fuels are energy-dense, meaning a little goes a long way. They have been the dominant energy source for over 150 years, so our systems are set up for their use. Additionally, they are cheaper than some alternative energy sources.
Fossil fuels are the largest driver of global climate change. They produce harmful greenhouse gases, such as carbon dioxide and methane, when burned. They also contribute to local air pollution, which is linked to millions of premature deaths each year.
Renewable energy sources, such as solar and wind power, are alternatives to fossil fuels. Nuclear energy is another zero-carbon alternative, but it is expensive and produces radioactive waste.
