Methane

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Methane (CH4) is a colorless, odorless, flammable, greenhouse gas. It is released naturally into the air from marshes, swamps, rice fields, ruminant animals (such as cattle), and sewage sludge. CH4 is also released from methane-producing bacteria (methanogens) that live in anaerobic places.

 

Definition source: University Corporation for Atmospheric Research

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