Methane:
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Methane (CH4) is a colourless, odourless, and highly flammable gas composed of one carbon atom and four hydrogen atoms.
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Methane is found in small quantities in Earth’s atmosphere. Methane is also a powerful greenhouse gas.
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Major natural sources of methane include emissions from wetlands and oceans, and from the digestive processes of termites.
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Major anthropogenic sources: Methane sources related to human activities include rice production, landfills, raising cattle and other ruminant animals, and energy generation.