Mercedes Mullins
Fossil fuels, including coal, oil, and natural gas, have been powering economies and human activities for over 150 years. They are formed from the carbon-rich remains of prehistoric organisms, such as animals and plants, through processes of anaerobic decomposition and exposure to heat and pressure in the Earth's crust over millions of years. The extraction and burning of fossil fuels have been crucial for human development, providing energy for direct use, powering engines, and generating electricity. However, the large-scale extraction and burning of fossil fuels have also caused significant environmental damage, contributing to climate change, air pollution, and health issues. As a result, there is a growing shift towards exploring sustainable renewable energy sources and implementing legal interventions to reduce the impact of the fossil fuel industry.
| Characteristics | Values |
|---|---|
| Formation | Fossil fuels are formed from the remains of dead plants and animals, exposed to heat and pressure in the Earth's crust over millions of years. |
| Extraction Methods | Drilling, mining, and surface mining are common methods used to extract fossil fuels from the earth. |
| Examples | Fossil fuels include coal, oil, and natural gas. |
| Uses | Fossil fuels are used for energy production, electricity generation, transportation, and the creation of derivatives like gasoline, plastics, and pesticides. |
| Environmental Impact | Burning fossil fuels releases greenhouse gases, contributing to climate change, air pollution, and health issues such as respiratory diseases. |
| Alternatives | Renewable energy sources, such as wind, solar, and hydroelectric power, are cleaner alternatives to fossil fuels. |
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What You'll Learn
Drilling and mining
Oil and natural gas deposits are found underground and can be extracted by drilling through layers of sand, silt, and rock. Petroleum is usually found one to two miles (1.6 to 3.2 km) below the Earth's surface. Oil can also be found in underground reservoirs, in the cracks, crevices, and pores of sedimentary rock, or in tar sands near the Earth's surface. Tar sands, or oil sands, are sandstones that contain petroleum products that are highly viscous (like tar), and thus cannot be drilled and pumped out of the ground like conventional oil. Instead, they can be mined through strip mining or open-pit mining, a type of surface mining that involves forming a progressively deeper hole.
To access conventional oil and natural gas, the trap is first pierced. Initially, they are under high enough pressure to drive them out of the well (primary recovery). Next, water or gas is injected to force more fossil fuels out (secondary recovery). Finally, enhanced oil recovery (tertiary recovery) may be used to extract further oil by applying heat (e.g. injecting steam) or injecting carbon dioxide or other gases. Each stage of recovery is increasingly expensive, and extraction from a well continues as long as it remains profitable.
Coal is extracted through coal mining, and oil and gas are extracted by drilling wells on land and offshore. Oil shale can be burned directly like coal or baked in the presence of hydrogen to extract liquid petroleum. In order to get the oil out, the material must be mined and heated, which is expensive and typically has a negative impact on the environment.
The extraction of fossil fuels through drilling and mining has been criticized for its negative environmental and health impacts. For example, drilling and mining operations generate enormous volumes of wastewater, which can be contaminated with heavy metals, radioactive materials, and other pollutants. This wastewater can leak or overflow into waterways and contaminate aquifers, causing serious health issues for surrounding communities. Additionally, the burning and extraction of fossil fuels contribute significantly to climate change and air pollution.
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Extraction from shale and tar sands
Oil shale is a type of sedimentary rock that contains organic matter from which petroleum products can be extracted. It is also known to contain kerogen, which can be released as a petroleum-like liquid when the rock is heated. The United States is known to hold more than half of the world's oil shale, with the largest known deposits located in a 16,000-square-mile area of the Green River Formation in Colorado, Utah, and Wyoming. The total in-place oil shale resources in this region are estimated at 4.3 trillion barrels.
Tar sands, on the other hand, are a combination of clay, sand, water, and bitumen, which is a heavy hydrocarbon. The bitumen in tar sands can be refined into oil, similar to the kerogen in oil shale. Tar sands development is already taking place in some parts of the United States, particularly in Alberta, Canada, where it has become one of the fastest-growing sources of greenhouse gas emissions.
The extraction of fossil fuels from shale and tar sands is considered environmentally destructive and water and energy-intensive. It has been associated with the destruction of species habitats, vast water waste, air and water pollution, and land degradation. Additionally, the production of shale oil results in 50% more CO2 emissions compared to the production of crude oil, contributing to global warming.
There are two methods for extracting shale oil: one similar to coal extraction involving underground, open-pit, or strip mining, and the other requiring the additional steps of pulverizing the shale and cooking it in giant kilns to extract the oil. Tar sands can be extracted using traditional mining techniques, such as strip mining, or through in-situ methods.
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Coal ash dumping
Coal ash, also known as coal combustion residuals (CCRs), is produced from the burning of coal in coal-fired power plants. CCRs are one of the largest industrial waste streams in the US, with nearly 130 million tons generated in 2014. Coal ash contains contaminants like mercury, cadmium, and arsenic, which are associated with cancer and other serious health issues.
The disposal of coal ash depends on factors such as the type of byproduct, the processes at the plant, and the regulations the power plant follows. Some common disposal methods include surface impoundments, landfills, and discharge into nearby waterways. However, improper disposal of coal ash has led to environmental and economic damage, as the contaminants can leach into groundwater and migrate to drinking water sources.
To address the risks associated with improper coal ash dumping, the Environmental Protection Agency (EPA) has established national rules and regulations for coal ash disposal. These regulations aim to ensure the safe disposal of CCRs and protect human health and the environment. The EPA's Coal Ash Surface Impoundment Integrity Assessment Program evaluates the condition and safety of coal ash ponds nationwide.
Despite these regulations, there is still a lack of oversight in coal ash dumping, and contamination of water sources remains a concern. The toxic components of coal ash can seep into groundwater and aquifers, endangering wildlife and human health. Proper closure and remediation of coal ash dumpsites are crucial to preventing further pollution. In some cases, coal ash is reused or recycled into products like concrete or wallboard, providing environmental and economic benefits by reducing the need for landfill disposal and the use of other materials.
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Oil pipelines
The history of oil pipelines can be traced back to the 1860s when the first crude oil pipeline was constructed by the Oil Transport Association. This 6-mile (9.7 km) wrought iron pipeline connected an oil field in Pennsylvania to a railroad station in Oil Creek. During World War II, the "Big Inch" and "Little Big Inch" pipelines were built to counter the threat of German submarine attacks on coastal tankers.
In the United States, 70% of crude oil and petroleum products are shipped through pipelines, covering a vast network of over 190,000 miles. The US pipeline system accounts for 65% of the total pipeline mileage in 120 countries surveyed in 2014. Canada also relies heavily on pipelines, with 97% of natural gas and petroleum products being shipped through them.
Pipelines offer significant advantages over other modes of transportation, such as trucks, trains, or barges. They are more cost-effective, with pipeline transport costing about half as much as rail transport per barrel. Additionally, pipelines operate 24 hours a day, ensuring a continuous flow of oil and its products to meet the demands of consumers and businesses.
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Underground reservoirs
Fossil fuels—including coal, oil, and natural gas—have been powering economies for over 150 years, currently supplying about 80% of the world's energy. The majority of the world's oil is pumped out of underground reservoirs, but it can also be sourced from deposits in shale and tar sands. Oil is accessed by drilling through layers of sand, silt, and rock, or by strip mining in the case of tar sands oil and oil shale. Conventional oil and natural gas are under high pressure, which drives them out of the well (primary recovery). Water or gas is then injected to force more fossil fuels out (secondary recovery). Finally, enhanced oil recovery (tertiary recovery) may be used to extract further oil by applying heat or injecting carbon dioxide or other gases.
Coal is a solid, carbon-heavy rock that is extracted via underground mining using heavy machinery to cut coal from deep underground deposits, or surface mining (also known as strip mining) which removes entire layers of soil and rock to access coal deposits below. Two-thirds of coal sourced in the United States is from strip mining. Coal fields date back to the Carboniferous period of Earth's history.
Unconventional gas is any form of gas that is too difficult or expensive to extract via regular drilling, requiring a special stimulation technique such as fracking. Fracking involves mixing water with sand and chemicals, then injecting it underground to flush fossil fuels from the fissures previously created by explosives.
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Frequently asked questions
Fossil fuels are flammable carbon compounds or hydrocarbons that are formed from the remains of prehistoric organisms such as animals and plants.
Fossil fuels are removed from the earth through processes such as drilling, mining, and extraction. The most common method for coal extraction, for example, is surface mining, which involves removing the top layers of soil and rock to access the coal.
Fossil fuels are used to generate electricity, provide energy for direct use (e.g. cooking, heating, lighting), power heat engines, and more.
The burning of fossil fuels releases greenhouse gases, such as carbon dioxide and nitrous oxide, into the atmosphere, contributing to climate change and global warming. It also emits pollutants that reduce air quality and harm human health.
