Like carbon dioxide, methane is a greenhouse gas whose molecules absorb heat trying to escape to space. Methane contributes to the Earth's natural greenhouse effect. Man-made emissions of methane are helping to enhance the greenhouse effect. Since the beginning of the Industrial Revolution, atmospheric methane concentration has more than doubled, and has contributed 20% to the enhancement of the greenhouse effect, second only to carbon dioxide.

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An odorless, colorless, flammable gas with the formula CH4 that is the primary constituent of natural gas.