Mercedes Mullins
Fossil fuels are compound mixtures of fossilized plant and animal remnants from millions of years ago. They include coal, petroleum, natural gas, oil shales, bitumens, tar sands, and heavy oils. Fossil fuels are non-renewable energy sources that have been consumed at an ever-increasing rate since the Industrial Revolution. They are formed through geological processes acting on organic matter, which results in the creation of fossil fuels such as oil, natural gas, or coal. The burning of fossil fuels releases carbon into the Earth's atmosphere and is a major contributor to global warming and ocean acidification.
| Characteristics | Values |
|---|---|
| Definition | Fossil fuel is a generic term for non-renewable energy sources |
| Examples | Coal, coal products, natural gas, derived gas, crude oil, petroleum products, non-renewable wastes, heavy oils, oil shales, bitumens, tar sands |
| Origin | Fossil fuels originate from plants and animals that existed in the geological past (for example, millions of years ago) |
| Composition | Fossil fuels are compound mixtures made of fossilized plant and animal remnants and are carbon-based |
| Energy | Fossil fuels are a source of energy |
| Usage | Fossil fuels are burned to produce electricity or refined for use as fuel for heating or transportation |
| Environmental Impact | Burning fossil fuels is the main source of greenhouse gas emissions causing global warming and ocean acidification |
| Global Consumption | Fossil fuels provide roughly 80% of the world's energy |
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What You'll Learn
Coal
The conversion of dead vegetation into coal is called coalification. During the geologic past, the Earth had dense forests in low-lying areas. In these wetlands, the process of coalification began when dead plant matter was protected from oxidation, usually by mud or acidic water, and was converted into peat. Coal is classified into four main types, or ranks: anthracite, bituminous, subbituminous, and lignite. The ranking depends on the types and amounts of carbon the coal contains and the amount of heat energy the coal can produce. Anthracite contains 86%–97% carbon and generally has the highest heating value of all coal ranks. Lignite contains 25%–35% carbon and has the lowest energy content of all coal ranks. Lignite coal deposits tend to be relatively young and were not subjected to extreme heat or pressure.
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Oil
The burning of oil and its derivatives contributes to atmospheric particulate matter, smog, and acid rain, and releases toxic gases and high amounts of carbon dioxide (CO2), a greenhouse gas. This has a number of harmful environmental consequences, including air and water pollution, and poses a hazard to aquatic organisms. Oil refineries also have negative environmental impacts.
In addition to the effects of burning oil, the extraction and distribution of oil also have environmental implications. Offshore oil drilling requires the combustion of additional fossil fuels, and crude oil is typically transported by tanker ships. Oil spills can also have significant negative impacts on the environment.
Due to the environmental impacts of oil and other fossil fuels, there has been a growing movement to transition to renewable and sustainable energy sources, such as wind, solar, hydroelectric, tidal, geothermal, and biofuels.
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Gas
Natural gas is a fossil fuel that is formed from the fossilized remains of plants and animals from millions of years ago. It is a mixture of hydrocarbon-containing materials of biological origin occurring within Earth's crust. Natural gas deposits are found on land and some are offshore and deep under the ocean floor. Natural gas can be found in large cracks and spaces between layers of overlying rock, in the tiny pores within some formations of shale, sandstone, and other types of sedimentary rock, and with deposits of crude oil. Natural gas found in coal deposits is called coalbed methane.
Natural gas is considered a valuable resource. It is used as a source of energy and can be burned in the open atmosphere to produce heat. The heat produced by burning natural gas can be used directly, as in home furnaces, or to produce steam to drive generators that supply electricity. Natural gas can also be used to increase pressure and temperature in combustion products to furnish motive power, as in gas turbines in jet aircraft.
Natural gas deposits are the main source of helium. Natural gas withdrawn from natural gas or crude oil wells is called wet natural gas because it usually contains methane, NGLs (ethane, propane, butanes, and pentanes), and water vapour. It may also contain non-hydrocarbons such as sulfur, helium, nitrogen, hydrogen sulfide, and carbon dioxide, which are mostly removed before being sold to consumers. The separated NGLs are called natural gas plant liquids (NGPLs), while the processed natural gas is called dry, consumer-grade, or pipeline-quality natural gas.
The creation of natural gas from fossils is determined by the type of fossil, the amount of heat, and the amount of pressure. Natural gas is formed when fossil material is buried deeper underground and subjected to increased heat and pressure. Terrestrial plants tend to form methane, a potent greenhouse gas and the chief constituent of natural gas.
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Natural gas
The extraction and consumption of natural gas are major industries. Natural gas can be burned for heating, cooking, and electricity generation. When burned for heat or electricity, natural gas emits fewer toxic air pollutants, less carbon dioxide, and almost no particulate matter compared to other fossil fuels. However, gas venting and unintended fugitive emissions throughout the supply chain can result in natural gas having a similar carbon footprint to other fossil fuels overall.
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Petroleum
The commercial exploitation of petroleum began in the 19th century, and it has since become a significant energy source worldwide. Petroleum is a crucial feedstock for the petrochemical industry, and its derivatives have various applications. For instance, natural gas, once considered a waste product of petroleum production, is now a valuable energy source, and heavy crude oil is an important fossil fuel.
The process of extracting and consuming petroleum has environmental implications. As reserves of conventional oil deplete, companies are turning to more challenging and environmentally detrimental extraction methods, such as extracting heavy oil from tar sands and oil shales. The burning of petroleum products releases greenhouse gases, contributing to global warming and ocean acidification.
The recognition of the negative impacts of the petroleum industry has spurred a transition towards renewable and sustainable energy sources. However, due to the industry's deep integration into the global economy and heavy subsidies, this shift is expected to have significant economic repercussions.
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Frequently asked questions
Fossil fuels are compound mixtures made of fossilized plant and animal remnants from millions of years ago.
Fossil fuels include coal, petroleum, natural gas, oil shales, bitumens, tar sands, heavy oils, and crude oil.
Fossil fuels are formed through the process of photosynthesis, which uses energy from the sun to change carbon dioxide and water into the molecular building blocks of ancient plants and animals. As these plants and animals began to get buried underground, they were subjected to increased heat and pressure, which eventually formed fossil fuels.
The burning of fossil fuels releases large amounts of carbon dioxide (CO2) and other greenhouse gases into the atmosphere, contributing to global warming and climate change. Fossil fuels also contain radioactive materials, such as uranium and thorium, which are released into the atmosphere during combustion.
Yes, low-carbon sources of energy such as nuclear, wind, solar, hydroelectric, tidal, geothermal, and biofuels are available as alternatives to fossil fuels. The transition to these renewable energy sources is important to reduce the environmental impact of energy consumption.
