Helena Joyce
Natural gas is often marketed as a clean energy source, but it is a fossil fuel that contributes to climate change and pollutes the air and water. The burning of natural gas releases carbon dioxide into the atmosphere, increasing CO2 levels, trapping heat, and contributing to global climate change. While it is a cleaner burning resource than coal and liquid petroleum, it emits carbon into the atmosphere in the form of CO2 and methane. Methane is leaked in large quantities during the extraction and transport of natural gas, and is a strong greenhouse gas that leaks into the atmosphere. Natural gas wells and pipelines often have engines to run equipment and compressors, which produce air pollutants and noise.
| Characteristics | Values |
|---|---|
| Air pollution | Burning natural gas releases nitrogen oxides (NOx), which are precursors to smog, and small amounts of sulfur, mercury, and particulates. Natural gas leaks at extraction sites release pollutants such as volatile organic compounds (VOCs), which react to form ground-level ozone (smog). |
| Water pollution | Hydraulic fracturing (fracking) uses large amounts of water, which can affect aquatic habitats and water availability. Wastewater disposal from fracking can contaminate groundwater. |
| Greenhouse gas emissions | Natural gas emits lower levels of carbon dioxide (CO2) than coal or oil but higher levels than clean energy sources like wind or solar. It also releases methane, a potent greenhouse gas that leaks during extraction and transport. |
| Climate change | Natural gas is a fossil fuel that contributes to global climate change by increasing CO2 levels and trapping heat. |
| Health impacts | Exposure to air pollutants from natural gas development can lead to respiratory symptoms, cardiovascular disease, and cancer. People living near gas well sites are at higher risk. |
| Land use | Drilling and infrastructure development for natural gas can alter land use and harm local ecosystems through erosion and habitat fragmentation. |
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What You'll Learn
- Natural gas is a fossil fuel that emits pollution
- It is marketed as a clean energy source, but it contributes to climate change
- Its extraction and transportation can cause water and air pollution
- Natural gas leaks can cause environmental issues like groundwater contamination
- It is cheaper and more reliable than other fossil fuels
Natural gas is a fossil fuel that emits pollution
Natural gas is a fossil fuel formed from the remains of plants, animals, and marine microorganisms that lived and were deposited in an oxygen-poor environment millions of years ago. It is composed mainly of methane, with some carbon dioxide, water vapour, and other compounds.
Natural gas emits pollution and is a significant contributor to climate change. The combustion of natural gas releases nitrogen oxides, small amounts of sulfur, mercury, and particulates, which are precursors to smog. The drilling, extraction, and transportation of natural gas can result in the leakage of methane, a powerful greenhouse gas with a much higher heat-trapping potential than carbon dioxide. Methane leaks can occur from natural gas wells, storage tanks, pipelines, and processing plants, and during flaring, the practice of burning off excess gas at well sites. Flaring produces carbon dioxide, carbon monoxide, sulfur dioxide, nitrogen oxides, and other compounds, though it is safer than releasing natural gas into the atmosphere and reduces overall greenhouse gas emissions.
The use of natural gas for cooking and heating contributes to poor indoor air quality and can lead to respiratory issues such as asthma. Studies have also found that living near unconventional gas well sites increases the risk of adverse health effects from air pollution. In addition to air pollution, natural gas development can impact water quality and availability due to the high water consumption required for fracking.
Compared to other fossil fuels like coal and oil, natural gas produces fewer carbon dioxide emissions and toxic air pollutants when burned. However, when considering the full lifecycle of natural gas, including production and transportation, its greenhouse gas emissions may be similar to or higher than those of other fossil fuels.
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It is marketed as a clean energy source, but it contributes to climate change
Natural gas is often marketed as a clean energy source, but it is a fossil fuel that contributes to climate change and pollutes our air and water. While burning natural gas releases fewer emissions of nearly all types of air pollutants and carbon dioxide (CO2) emissions than burning coal or petroleum products, it still emits a large amount of carbon into the atmosphere in the form of both CO2 and methane.
Methane is the main component of natural gas, making up 70% or more of raw natural gas in the ground and well over 95% of the processed gas we burn for energy. When burned, methane turns into CO2, but before then, it can escape into the atmosphere from all parts of the gas infrastructure, like valves and pipes. Methane is a more potent greenhouse gas than carbon dioxide, and it is leaked in large quantities during the extraction and transport of natural gas. The U.S. Environmental Protection Agency estimates that about 6.5 million metric tons of methane leak from the oil and gas supply chain each year, around 1% of total natural gas production. However, other scientists have reported much larger figures for methane leaks, with some studies finding leak rates of "0.65% to 66.2%."
The combustion of natural gas also produces nitrogen oxides (NOx), which are precursors to smog, and small amounts of sulfur, mercury, and particulates. In addition, the drilling and extraction of gas from wells and its transportation in pipelines can result in the leakage of methane and other harmful air pollutants. The construction and land disturbance required for oil and gas drilling can also alter land use and harm local ecosystems by causing erosion and fragmenting wildlife.
Furthermore, water pollution is another effect of natural gas extraction. Hydraulic fracturing, or fracking, is a process by which natural gas is extracted from wells, and it requires large amounts of water. In some areas, high water consumption for fracking may impact aquatic habitats and the availability of water for other uses. The wastewater from these wells is often disposed of by injecting it deep underground, but evidence suggests that these wells can cause earthquakes and increase the potential for groundwater contamination.
Overall, while natural gas may burn cleaner than coal or petroleum products, it still contributes to climate change and has other environmental impacts that must be considered when evaluating its use as an energy source.
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Its extraction and transportation can cause water and air pollution
The extraction of natural gas can cause water and air pollution. When geologists explore for natural gas deposits on land, they may disturb vegetation and soil with their vehicles. Drilling a natural gas well on land may require clearing and levelling an area around the well site. Well drilling activities produce air pollution and may disturb people, wildlife, and water resources. Laying pipelines that transport natural gas from wells usually requires clearing land to bury the pipe.
Natural gas production can also produce large volumes of contaminated water. This water requires proper handling, storage, and treatment so that it does not pollute land and other waters. In some areas of the country, high water consumption for fracking may affect aquatic habitats and the availability of water for other uses. If mismanaged, hydraulic fracturing fluid—which may contain potentially hazardous chemicals—could be released through spills, leaks, faulty well construction, or other exposure pathways. These releases could contaminate surrounding areas.
Additionally, during the extraction process, natural gas can be released into the atmosphere during and after well drilling. Some natural gas leaks into the atmosphere from oil and natural gas wells, storage tanks, pipelines, and processing plants. The U.S. Environmental Protection Agency estimates that in 2021, methane emissions from natural gas and petroleum systems and from abandoned oil and natural gas wells were the source of about 33% of total U.S. emissions.
The transportation of natural gas can also cause air pollution. Natural gas wells and pipelines often have engines to run equipment and compressors, which produce air pollutants and noise. In some areas, natural gas produced at oil wells is not economical to transport for sale or contains high concentrations of hydrogen sulfide (a toxic gas), so it is burned (flared) at well sites. Natural gas flaring produces CO2, carbon monoxide, sulfur dioxide, nitrogen oxides, and many other compounds, depending on the chemical composition of the natural gas and on how well it burns in the flare.
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Natural gas leaks can cause environmental issues like groundwater contamination
Natural gas is often marketed as a clean energy source. However, it is a fossil fuel that contributes to climate change and pollutes the air and water. The burning of fossil fuels releases carbon dioxide into the atmosphere, increasing CO2 levels, trapping heat, and contributing to global climate change. While natural gas produces fewer emissions than coal or petroleum products, it still emits a large amount of carbon into the atmosphere in the form of CO2 and methane.
Hydraulic fracturing, or fracking, is a dangerous practice that uses large amounts of water and can affect aquatic habitats and water availability. Evidence suggests that the disposal of wastewater by injecting it underground can cause earthquakes and increase the potential for groundwater contamination. Accidents or poorly built wells can lead to contamination of groundwater by additives in fracking fluid. Improperly constructed or failing wells can allow gas to leak from the well into groundwater.
In a study of hydraulic fracturing impacts in Michigan, potential environmental impacts included increased erosion and sedimentation, increased risk of aquatic contamination, habitat fragmentation, and reduction of surface waters due to lowered groundwater levels. In several cases, groundwater was contaminated from surface leaks and spills of fracturing fluid. Unlike groundwater contamination risks, surface water contamination risks are mostly related to land management and on- and off-site chemical and wastewater management.
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It is cheaper and more reliable than other fossil fuels
Natural gas is a fossil fuel that is often touted as a cheaper and more reliable energy alternative to other fossil fuels. Compared to other fossil fuels, such as coal and petroleum products, natural gas produces fewer emissions of air pollutants and carbon dioxide (CO2) for the same amount of energy produced. This is primarily due to the clean-burning properties of natural gas, which result in lower carbon dioxide emissions per unit of energy—approximately half that of coal. As a result, natural gas has become an increasingly popular choice for electricity generation and fleet vehicle fuel, particularly in the United States.
However, it is important to acknowledge the environmental impacts associated with natural gas extraction, production, and transportation. The process of drilling and extracting natural gas from wells can result in the leakage of methane, a potent greenhouse gas that is significantly more effective at trapping heat over time than CO2. While burning natural gas produces fewer emissions than other fossil fuels, the overall environmental impact of natural gas depends on factors such as leakage rates, energy conversion efficiency, and the time frame for evaluating global warming potential.
One of the key advantages of natural gas that contributes to its cost-effectiveness is the development of new drilling and recovery technologies. Horizontal and directional drilling techniques have increased the productivity of natural gas wells, reducing the need for multiple wells in a field. Additionally, hydraulic fracturing (fracking) has opened up previously inaccessible reserves of natural gas. However, fracking has been associated with environmental concerns, including high water consumption, which can impact aquatic habitats and water availability for other purposes.
Despite these concerns, natural gas is still considered a more reliable energy source than other fossil fuels due to its abundance and the development of advanced technologies for its extraction and use. These technologies, including satellites, global positioning systems, and remote sensing devices, have made it easier to discover natural gas reserves and reduce the land area disturbed during development. Additionally, strict government regulations and industry standards have been implemented to ensure the safe transportation, storage, distribution, and consumption of natural gas, further enhancing its reliability.
In summary, natural gas is often considered a cheaper and more reliable energy source compared to other fossil fuels due to its lower emissions, advanced extraction technologies, and stringent safety regulations. However, it is important to acknowledge the environmental impacts associated with natural gas, particularly methane leakage, and the need for effective policies and investments to mitigate these issues.
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Frequently asked questions
Yes, natural gas is a fossil fuel and emits pollution. It is a major contributor to air and water pollution and climate change.
The combustion of natural gas produces nitrogen oxides (NOx), which are precursors to smog, and small amounts of sulfur, mercury, and particulates. It also releases methane, a strong greenhouse gas that leaks into the atmosphere.
Hydraulic fracturing, or fracking, is a process used to extract natural gas that requires large amounts of water. This can affect aquatic habitats and water availability for other uses. The wastewater from fracking is often disposed of by injecting it underground, which can cause earthquakes and groundwater contamination.
Yes, building the infrastructure to transport natural gas can cause habitat fragmentation and cross key natural areas. Gas leaks from pipes can also cause groundwater pollution and impact surface water.
Natural gas is often marketed as a clean energy source, and it is true that it emits fewer harmful pollutants than other fossil fuels like coal and petroleum. However, it is still a polluting energy source and there are cleaner alternatives like wind or solar power.
