Sources of Methane Emissions Methane is produced by the breakdown or decay of organic material and can be introduced into the atmosphere by either natural processes – such as the decay of plant material in wetlands, the seepage of gas from underground deposits or the digestion of food by cattle – or human activities – such as oil and gas production, rice farming or waste management. There are natural methane emissions from sources such as wetlands, lakes, volcanoes and permafrost, but about 60 percent comes from human activities. Natural sources are multiple and diverse: wetland, lakes, reservoirs, termites, geological sources, hydrates etc. Across the globe, about 596 million tons of methane are emitted a year, according to the Global Carbon Project, which tracks greenhouse gas emissions. Methane enters the atmosphere from both natural (30 percent) and anthropogenic (70 percent) sources. Look where it comes from. Methanogens (methane-producing bacteria in swamps and wetlands) are the largest natural source. Natural Sources of Methane Surprise Climate Scientists Methane is 30 times more potent than carbon dioxide as a greenhouse gas. Methane Emissions from Combustion Sources / Natural Gas Engines Bryan Willson Director - Colorado State University Energy Institute Professor of Mechanical Engineering Presidential Chair in Energy Innovation ARPA-E REMEDY Workshop October 20, 2020 On methane specifically, a 2020 study found that global estimates of methane emissions from natural sources have been far too high, suggesting that the oil and gas industry may be responsible for 40% more methane in the atmosphere than previous estimates. Human activities contribute about 60% of total methane emissions. natural biogenic sources are responsible for an annual average flow of methane equal to about 540 million tons yr −1; 2. abiogenic natural sources from lithosphere and hydrosphere make up c. 1360 million tons of methane annually (therefore, a ratio between biogenic and abiogenic methane is 1:2.5 in natural sources… Other important natural sources of methane include termites (as a result of digestive processes), volcanoes, vents in the ocean floor, and methane hydrate deposits that occur along continental margins and beneath Antarctic ice and Arctic permafrost. The media are all reacting to the latest report from a federal commission on climate change, which says …

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