Helena Joyce
Methane is a powerful greenhouse gas and short-lived climate pollutant that is emitted from both natural sources and human activities. The largest sources of methane emissions from human activities are agriculture, fossil fuels, and decomposition of landfill waste. Abandoned coal mines, oil and gas wells, and livestock are also significant sources of methane emissions. Natural sources of methane include wetlands, seepages from near-surface hydrocarbon deposits, and wildfires. As methane is a key precursor to the harmful air pollutant tropospheric ozone, it is important to tackle all sources of methane emissions arising from human activity.
| Characteristics | Values |
|---|---|
| Sources of methane pollution | Human activities, natural sources |
| Human activities causing methane pollution | Agriculture, fossil fuels, decomposition of landfill waste, livestock, coal mining, oil and gas operations, industrial processes |
| Natural sources of methane pollution | Wetlands, thawing permafrost, wildfires, volcanic releases, termite emissions |
| Impact of methane pollution | Methane is a powerful greenhouse gas and short-lived climate pollutant (SLCP), contributing to global heating and rising atmospheric temperatures |
| Methane's role in air pollution | Methane is a precursor to the formation of ground-level (tropospheric) ozone, a dangerous air pollutant |
| Methane emission reduction targets | The GMP aims to reduce global methane emissions by at least 30% from 2020 levels by 2030 |
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What You'll Learn
Fossil fuels
Methane is emitted during the production and transport of coal, natural gas, and oil. This includes gas venting and leaks from active fossil fuel infrastructure, as well as from orphan wells and abandoned coal mines. Russia is the world's top methane emitter from oil and gas, while coal production is a key source of methane emissions in China.
The burning of fossil fuels, such as coal, natural gas, and oil, also releases methane into the atmosphere. Additionally, methane can be emitted during the extraction of oil and natural gas from underground reserves. The transportation of oil and natural gas via pipelines is another source of methane emissions.
Methane is a powerful greenhouse gas with a warming impact 86 times stronger than carbon dioxide per unit of mass over a 20-year period. It has an atmospheric lifetime of around 12 years. Reducing methane emissions can have a rapid and significant effect on mitigating climate change.
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Agriculture
In addition to livestock, certain agricultural practices also contribute to methane emissions. Paddy rice cultivation, for example, accounts for about 8% of human-linked methane emissions. In this cultivation method, flooded fields prevent oxygen from reaching the soil, creating conditions conducive to methane-emitting bacteria. Stubble burning is another agricultural practice that releases methane into the atmosphere.
The agriculture sector is a significant source of methane emissions, and these emissions have been increasing over time. To address this issue, various strategies are being explored. One approach is to provide animals with more nutritious feed to enhance their productivity and reduce methane production. Scientists are also experimenting with alternative feeds, such as Asparagopsis taxiformis, a type of red seaweed, which has shown promising results in reducing methane emissions from cattle. Additionally, improving manure management practices, such as covering, composting, or using manure to produce biogas, can help mitigate methane emissions.
While the focus has been on reducing emissions from livestock and specific agricultural practices, it is important to consider the broader context of agriculture's contribution to methane pollution. The production and transport of coal, natural gas, and oil can also lead to methane emissions, although these sources are typically associated with the energy and industry sectors. Nonetheless, they contribute to the overall methane pollution attributed to agricultural activities, as these energy sources are often utilized in agricultural processes.
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Landfills
The methane emissions from MSW landfills in 2022 were equivalent to the greenhouse gas emissions from more than 24 million gasoline-powered passenger vehicles driven for one year or the CO2 emissions from over 13 million homes' energy use for one year. Methane is a potent greenhouse gas that is much more effective at trapping heat in the atmosphere than CO2. Specifically, one ton of methane causes 72 times more warming than one ton of carbon dioxide over a 20-year period. Therefore, reducing methane emissions can have a swift and significant impact on curbing climate change.
To mitigate the environmental and health impacts of methane emissions from landfills, the U.S. Environmental Protection Agency (EPA) regulates landfill gas (LFG) from large MSW landfills. LFG is a natural byproduct of the decomposition of organic material in landfills, composed of roughly 50% methane and 50% carbon dioxide, with trace amounts of other compounds. The EPA requires landfills to capture and safely dispose of methane and hazardous non-methane organic compounds (NMOCs) from LFG. This can be done through flaring the gas or converting it into energy. The EPA's Landfill Methane Outreach Program (LMOP), established in 1994, encourages landfill operators to capture and harness LFG by providing technical assistance and facilitating partnerships. As of 2012, there were 605 operational energy projects in 48 states, producing approximately 15 billion kilowatt-hours of electricity and 100 billion cubic feet of LFG for direct use annually.
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Coal mining
Coal mine methane (CMM) refers to the methane released from coal and the surrounding rock strata due to mining activities. Underground mines, surface mines, and abandoned mines all release methane, though underground mines account for the vast majority of methane emissions from coal mining. In 2021, underground coal mines in the United States reported 29,135,039 metric tons of carbon dioxide equivalent (CO2e) emissions.
In underground mines, CMM is removed by ventilation systems, which is the largest source of CMM emissions. Sometimes, a degasification system is necessary to supplement the ventilation system. This system consists of a network of boreholes and gas pipelines. In abandoned and surface mines, methane escapes to the atmosphere through natural fissures or other diffuse sources. Drainage systems are a major source of emissions at surface mines.
Coal mine methane is a significant source of greenhouse gas emissions. Methane is 28–36 times more potent than carbon dioxide on a mass basis over a 100-year period. In 2022, just over 40 million tons of CMM were released into the atmosphere, representing more than 10% of total methane emissions from human activity. Coal production and related methane emissions are concentrated in a handful of countries, with China being the world's largest producer and emitter of CMM.
There are several opportunities to reduce methane emissions from coal mining. The Global Methane Initiative has estimated that about 64% of projected 2030 CMM emissions can be avoided with existing mitigation technologies. Reducing coal consumption is one of the most effective ways to cut down on CMM emissions. CMM can also be captured and used for various purposes, such as coal drying, a heat source for mine ventilation air, vehicle fuel, manufacturing feedstock, or a fuel source for fuel cells. In 2021, U.S. coal mines recovered and utilized more than 39 billion cubic feet of CMM.
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Oil and gas operations
Intentional venting occurs due to equipment design or operational practices, such as the continuous bleed of gas from pneumatic devices. It can also be done for safety reasons or due to facility design limitations. Unintentional leaks, also known as fugitive emissions, can happen at any stage of the oil and gas supply chain, from production to processing, transmission, and distribution. Leaks can occur in pipelines, storage tanks, and production-related equipment.
The magnitude of methane emissions from oil and gas operations is often underestimated. Studies have shown that government estimates may be significantly lower than the actual emissions, with some regions emitting rates well above expectations. This discrepancy is attributed to factors such as under-sampling of abnormal operating conditions and challenges in accurately measuring emissions from transient large point sources, such as blown-out flares.
The oil and gas industry has the potential to reduce methane emissions through various mitigation strategies. These include addressing intentional flaring and venting practices and tackling fugitive methane emissions. Accurate tracking of emissions and reduction efforts is crucial for effective climate change mitigation. Additionally, new technologies for detecting and measuring methane leaks can play a significant role in reducing emissions.
Methane is a potent greenhouse gas, with a much higher warming potential than carbon dioxide in the short term. Reducing methane emissions can have significant environmental and economic benefits, including avoiding additional warming and improving air quality.
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Frequently asked questions
Methane pollution comes from both natural sources and human activities.
Natural sources of methane pollution include wetlands, which contribute about 75% of the natural methane emissions. Other natural sources include seepages from near-surface hydrocarbon and clathrate hydrate deposits, volcanic releases, wildfires, and termite emissions.
Human activities that contribute to methane pollution include agriculture, fossil fuels, and decomposition of landfill waste. Oil and gas operations are the largest source of methane emissions from the fossil fuels sector. Abandoned coal mines and oil and gas wells have also become significant sources of methane emissions.
Methane is a powerful greenhouse gas and short-lived climate pollutant (SLCP) that affects air quality. It has a warming impact 86 times stronger than CO2 per unit of mass over a 20-year period. Methane also contributes to the formation of tropospheric ozone, a dangerous air pollutant that is responsible for about 1 million premature respiratory deaths globally.
