Meghan Hodges
Natural gas is a fossil fuel and major contributor to air pollution, 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. Unconventional gas development can also affect local and regional air quality, with residents living near gas well sites at greater risk of adverse health outcomes from air pollution. The drilling, extraction, and transportation of natural gas also result in the leakage of methane, a powerful greenhouse gas. While burning natural gas produces less carbon dioxide (CO2) than coal, the rise in natural gas production is a growing concern for climate scientists, who warn that the expansion of the industry could lock the world into a high-carbon and fast-warming future.
| Characteristics | Values |
|---|---|
| Natural gas is a | Fossil fuel |
| Natural gas produces | Half as much carbon dioxide (CO2) as coal |
| Natural gas is a major contributor to | Air pollution, water pollution, and climate change |
| Natural gas emits | Methane, a potent greenhouse gas |
| Natural gas production and use | Has seen a dramatic rise in the United States |
| Natural gas is a cleaner fuel as it produces | Fewer conventional air pollutants |
| Natural gas appliances | Expose people to respiratory disease-triggering pollutants |
| Natural gas drilling and extraction | Can cause erosion and contaminate water sources |
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What You'll Learn
Natural gas produces less CO2 than coal
Natural gas is a fossil fuel, and like any fossil fuel, it emits pollution and is a contributor to climate change. However, natural gas is often touted as a cleaner alternative to coal, and this is true in the sense that burning natural gas produces about half as much CO2 as coal when generating the same amount of energy.
The combustion of natural gas produces fewer emissions of nearly all types of air pollutants and carbon dioxide (CO2) emissions than burning coal or petroleum products. For every 1 million Btu consumed (burned), more than 200 pounds of CO2 are produced from coal, while natural gas emits just over 160 pounds of CO2. This has led to an increase in the use of natural gas for electricity generation and for fleet vehicle fuel in the United States.
Natural gas is also a much cheaper energy source than coal. According to Lazard, coal prices range from 60 to 143 USD per megawatt-hour, while the price of natural gas is between 41 and 74 USD. This makes natural gas a more economically viable option for energy generation.
However, natural gas is not a perfect solution. While it emits less CO2 than coal, it produces more methane, which is a much more powerful greenhouse gas. Methane is the primary component of natural gas and leaks into the atmosphere during its production. Methane is 34 times stronger than CO2 at trapping heat over a 100-year period and 80-90 times stronger over a 20-year period. The expansion of the natural gas industry could lead to a future of high carbon emissions and rapid warming.
In conclusion, while natural gas produces less CO2 than coal, it is not a completely clean energy source. The high methane emissions and other environmental impacts of natural gas extraction and production must be considered when evaluating its role in the transition to a low-carbon economy.
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Methane leaks from natural gas production
Natural gas is a fossil fuel, with methane (CH4) as its main ingredient. When burned, it produces about half as much carbon dioxide (CO2) as coal, but it is not harmless. It emits pollution and is a contributor to climate change.
The drilling and extraction of gas from wells and its transportation in pipelines result in the leakage of methane. The combustion of natural gas also produces nitrogen oxides (NOx), which are precursors to smog, and small amounts of sulfur, mercury, and particulates. The construction process can also cause erosion of dirt, minerals, and other harmful pollutants into nearby streams.
The magnitude of methane leaks in the oil and gas industry has been underestimated. A study in the journal Science Advances found that methane emissions in the Permian Basin between New Mexico and Texas were double the federal estimates. Surveys of US fossil fuel production sites have also suggested that official numbers underestimate the extent of the methane problem. Some small wells slowly leak gas at a rate of about one kilogram of methane per hour, while larger leaks can emit hundreds or thousands of kilograms per hour. In some cases, 1% of well sites can account for over half of total methane emissions.
The impact of methane leaks from natural gas production is significant. High methane leakage rates can erode the greenhouse gas reductions achieved when power companies switch from coal to gas. For example, a study by EDF found that gas burned to generate electricity loses its climate benefits relative to coal when the leakage rate exceeds 2.7% of production.
There have been efforts to address methane leaks, with technologies available to reduce them. The Oil and Gas Climate Initiative, comprising 12 companies, has established a $1 billion investment fund to curb methane emissions, reporting a 9% reduction in methane intensity in 2018. Over 100 countries have joined the Global Methane Pledge, aiming to cut methane emissions by 30% by the end of the decade. New rules and fees for methane emissions announced by the Biden administration are expected to help the US meet these targets.
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Natural gas contributes to air pollution
Natural gas is a fossil fuel and a major contributor to air pollution, water pollution, and climate change. The combustion of natural gas releases nitrogen oxides (NOx), which are precursors to smog, and small amounts of sulfur, mercury, and particulates. These emissions can lead to adverse health outcomes, including respiratory symptoms, cardiovascular disease, and cancer.
Natural gas production and use also contribute to air pollution through methane emissions. Methane is the primary component of natural gas and is released during the drilling, extraction, and transportation of gas. Methane is a potent greenhouse gas, with a warming effect up to 80-90 times more powerful than carbon dioxide over a 20-year period. The United States Environmental Protection Agency estimates that about 6.5 million metric tons of methane leak from the oil and gas supply chain annually, contributing to climate change.
Unconventional gas development can also impact local and regional air quality. Areas where drilling occurs may experience increased concentrations of hazardous air pollutants, including particulate matter and ozone, which can have harmful effects on human health and the environment.
Additionally, the construction process for natural gas infrastructure can cause erosion and the release of pollutants into nearby water sources, further contributing to air pollution through the release of dust and other particles.
While natural gas burns cleaner than other fossil fuels, producing less carbon dioxide and conventional air pollutants, the leaking of methane and other emissions associated with its production, transportation, and use contribute significantly to air pollution and climate change.
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Natural gas drilling affects water supplies
Natural gas is a fossil fuel, and its combustion emits pollution and contributes to climate change. While burning natural gas produces less carbon dioxide (CO2) than coal, it is not harmless. Climate scientists are concerned about the rising production of natural gas and its impact on climate change. The expansion of the natural gas industry could hinder efforts to stabilize the Earth's climate.
Natural gas drilling can have significant environmental impacts, including affecting water supplies. Firstly, the construction process for drilling can cause erosion of dirt, minerals, and other harmful pollutants into nearby streams. This can increase the risk of aquatic contamination from chemical spills or equipment runoff and reduce surface water levels due to groundwater extraction.
Hydraulic fracturing, or "fracking," used to extract natural gas, requires large amounts of water. This process produces significant amounts of wastewater, which may contain chemicals and other contaminants. Improper handling and disposal of this wastewater can contaminate water supplies. Studies have found increased levels of methane in drinking water sources near natural gas drilling sites, indicating contamination from hydraulic fracturing activities.
Additionally, the toxic chemicals used in the drilling process can pose a risk to drinking water supplies. The specific chemicals used in hydraulic fracturing are often not disclosed by manufacturers, making it challenging to fully understand their potential impact on water quality. The proximity of natural gas wells has been associated with health symptoms, including dermal and respiratory conditions, in residents living nearby.
To protect water supplies, it is crucial to implement measures such as proper wastewater treatment and disposal, constructing drilling sites with containment systems like steel tanks, and ensuring companies are financially responsible for cleanup and monitoring to prevent the spread of contaminants into water sources.
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Natural gas stoves expose people to pollutants
Natural gas is a fossil fuel that emits pollution and is a contributor to climate change. While burning natural gas produces about half as much carbon dioxide (CO2) as coal, it is not harmless. The combustion of natural gas produces nitrogen oxides (NOx), which are harmful to human health. Nitrogen dioxide (NO2) is produced when natural gas is burned at high temperatures in the presence of nitrogen in the atmosphere. Studies have shown that NO2 has many harmful health effects, including an increased risk of respiratory illness and asthma in children.
Gas stoves, which burn natural gas, release NO2 and other pollutants, such as benzene, a known carcinogen. Stanford researchers found that cooking with gas stoves can raise indoor levels of benzene above those found in secondhand smoke. Long-term exposure to NO2 in homes with gas stoves is estimated to cause thousands of deaths each year. People living in smaller homes are at a greater risk of exposure to NO2, and racial and ethnic minority groups are disproportionately affected.
In addition to NO2 and benzene, gas stoves also introduce other toxic chemicals into homes, such as hexane and toluene. These chemicals are known as volatile organic compounds (VOCs), and exposure to them can increase the risk of asthma, cancer, and other illnesses. Gas stoves also produce fine particulates (PM2.5), which are known to cause or exacerbate respiratory problems.
While electric stoves are a cleaner alternative, they may not be a feasible option for everyone. However, there are steps that people with gas stoves can take to reduce their exposure to pollutants, such as using ventilation, air purifiers, and exhaust fans.
The production and transportation of natural gas also contribute to pollution and climate change. Methane, the primary component of natural gas, is a powerful greenhouse gas that is released during the drilling, extraction, and transportation of natural gas. The expansion of the natural gas industry could further exacerbate climate change and increase methane emissions.
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Frequently asked questions
Natural gas produces half as much carbon dioxide (CO2) when burned compared to coal. However, it is still a fossil fuel and a major contributor to air pollution, water pollution, and climate change.
Natural gas is composed mostly of methane (CH4), which is a potent greenhouse gas with 80 times the heat-trapping potential of carbon dioxide over a 20-year period. Methane leaks during the production, transportation, and combustion of natural gas contribute significantly to air pollution and climate change.
The construction of natural gas infrastructure can cause erosion and sedimentation, leading to increased aquatic contamination and habitat fragmentation. Additionally, the use of hazardous chemicals during drilling and extraction processes can contaminate drinking water sources.
Natural gas produces fewer conventional air pollutants, such as sulfur dioxide and particulates, compared to coal or oil. However, it still emits pollutants that can harm human health, including nitrogen oxides (NOx), sulfur, mercury, and particulates. The combustion of natural gas can also expose people to respiratory disease-triggering pollutants.
