Mercedes Mullins
Fossil fuels are a non-renewable energy source formed over millions of years from the carbon-rich remains of dead plants and animals. The three primary fossil fuels are coal, oil, and natural gas, which are drilled, mined, or pumped from reservoirs and then burned to produce electricity or refined for use as fuel for heating or transportation. Oil and natural gas are found worldwide, but most of the reserves are in Saudi Arabia, Russia, the United States, and Iran. Coal reserves are found in every country, but the largest are in the United States, Russia, China, Australia, and India.
| Characteristics | Values |
|---|---|
| Definition | Flammable carbon compound- or hydrocarbon-containing material formed naturally in the Earth's crust from the buried remains of prehistoric organisms (animals, plants, or microplanktons) |
| Formation | Formed within geological formations over millions of years |
| Sources | Coal, petroleum, natural gas, oil shales, bitumens, tar sands, heavy oils |
| Uses | Used for cooking, heating, lighting, powering heat engines, generating electricity, creating derivatives such as kerosene, gasoline, diesel, plastics, pesticides, fertilizers, pharmaceuticals |
| Environmental Impact | Burning releases nitrogen oxides, contributing to smog and acid rain, greenhouse gases, and climate change |
| Health Impact | Air and water pollution, global warming, health risks |
| Energy Production | Fossil fuels supply about 80% of the world's energy |
| Inflation Impact | Dependence on fossil fuels can drive inflation |
| Alternatives | Renewable energy sources such as wind, solar, hydropower, biomass, geothermal, and biofuels |
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What You'll Learn
Coal
The extraction and burning of coal have significant negative impacts on the environment and human health. It is the largest anthropogenic source of carbon dioxide emissions, contributing to climate change. In 2020, coal burning emitted 14 billion tonnes of carbon dioxide, accounting for 40% of total fossil fuel emissions and over 25% of total global greenhouse gas emissions. Coal fires burning underground can cause the ground to subside, release dangerous combustion gases, and initiate surface wildfires.
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Oil
The extraction of oil has had a significant environmental impact, with thousands of oil spills occurring each year in the United States alone. These spills can have long-lasting effects on ecosystems, as seen in the 2010 BP Deepwater Horizon disaster in the Gulf of Mexico. Beyond the immediate consequences, the combustion of oil releases toxic gases and high levels of carbon dioxide, contributing to climate change and negatively impacting human health.
Despite the environmental and climate concerns associated with oil, it continues to play a significant role in the global economy. The transition to renewable energy sources, such as hydropower, biomass, wind, geothermal, and solar power, is gaining momentum, but oil remains a crucial energy source in the present. Oil's high carbon cost compared to more easily accessible reserves has led to disinvestment in its exploitation, but it still holds a prominent position in the energy landscape.
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Natural gas
In conventional natural gas deposits, the natural gas generally flows easily up through wells to the surface. In the US and a few other countries, natural gas is produced from shale and other types of sedimentary rock formations by forcing water, chemicals, and sand down a well under high pressure. This process is called hydraulic fracturing or fracking. It breaks up the formation, releases the natural gas from the rock, and allows the gas to flow to and up wells to the surface. At the top of the well, natural gas is collected in gathering pipelines and sent to natural gas processing plants. Before natural gas can be burned as a fuel or used in manufacturing processes, it almost always has to be processed to remove impurities such as water.
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Oil shale
The extraction of oil shale can damage the biological and recreational value of the land and the ecosystem in the mining area. Combustion and thermal processing generate waste material and carbon dioxide, a greenhouse gas. Oil shale production has a potentially significant impact on the natural environment, including carbon emission, water consumption, groundwater contamination, and disturbance of land surfaces. Environmentalists oppose the production and usage of oil shale as it creates even more greenhouse gases than conventional fossil fuels.
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Tar sands
The process of extracting and converting tar sands into usable fuel is complex, energy-intensive, and environmentally destructive. It involves strip mining or underground heating to separate the bitumen from the sand, clay, and water. This process generates large amounts of toxic waste and air and water pollution, including the creation of tailing ponds that can be harmful to local wildlife and human communities. Despite these environmental concerns, the development of tar sands has provided economic benefits to local communities, including job creation and increased energy security.
One of the largest deposits of tar sands is located in Alberta, Canada, where it has become a significant source of oil for both Canada and the United States. The development of these tar sands has contributed to Canada becoming the largest foreign supplier of oil to the US, reducing its dependence on OPEC products. Additionally, the tar sands industry has created numerous jobs in Alberta and other regions, providing economic opportunities for workers and local communities.
However, the environmental impact of tar sands extraction has been a significant concern for First Nations communities and environmental groups. The extraction process has led to the destruction of boreal forests and the contamination of water sources, with toxic runoff and wastewater containment ponds affecting the health and traditional ways of life of these communities. There are also concerns about increased cancer risks associated with the presence of cancer-causing chemicals linked to tar sands operations. As a result, there have been calls for a moratorium on new tar sands development and the halting of pipelines to transport tar sands oil, such as the Keystone XL pipeline.
While tar sands provide a secure and strategic source of energy, the environmental and social costs associated with their extraction and processing have sparked debates and efforts to transition towards cleaner energy alternatives. The cancellation of mining contracts and the decline in fuel prices have slowed down the expansion of the tar sands industry. Nevertheless, the balance between the economic benefits and the environmental and social impacts of tar sands development remains a complex issue that requires careful consideration and sustainable solutions.
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Frequently asked questions
Fossil fuels are a class of hydrocarbon-containing materials of biological origin occurring within Earth’s crust that can be used as a source of energy.
The main sources of fossil fuels include coal, oil, and natural gas. Oil is mostly pumped out of underground reservoirs, but can also be sourced from shale and tar sands. Coal is extracted via underground mining or surface mining. Natural gas deposits are the main source of helium.
Fossil fuels are burned to produce electricity, or refined for use as fuel for heating or transportation.
