Methane is a gas that occurs naturally in the environment through hydrates, termites, and anaerobic processes like decay, but these days over 2/3 of it is produced due to human pursuits. Common livestock including cattle and sheep have a specialized digestive process to digest tough grasses. Fermentation in their gut that produces methane is released through flatulence. Mining, landfills, and agricultural and industrial activities are some other common contributors. There is far more concentration of carbon dioxide in the atmosphere, but methane is 20 times more effective at holding heat. Methane has fluctuated naturally for thousands of years, but it’s concentration is higher now than in the last 400,000 years, worrying global warming researchers.
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