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The simplest hydrocarbon, methane is a gas with a chemical formula of CH4.

A principal component of natural gas, methane is a significant fuel. Burning one molecule of methane in the presence of oxygen releases one molecule of CO2 (carbon dioxide) and four molecules of H2O (water):

CH4 + 2O2 → CO2 + 2H2O

The strength of the carbon-hydrogen covalent bond in methane is among the strongest in all hydrocarbons, and thus its use as a chemical feedstock[?] is limited. The search for catalysts which can facilitate C-H bond activation in methane and other low alkanes is an area of research with considerable industrial significance.

Methane is a greenhouse gas with a global warming potential of 22 (meaning that it has 22 times the warming ability of carbon dioxide).

Methane results from the decomposition of certain organic matters in the absence of oxygen. It is therefore also classified as a biogas.

Principal sources are

75% of the world emissions are of human source. They come primarily from agricultural and other human activities. During the past 200 years, the concentration of this gas in the atmosphere doubled, passing from 0.8 to 1.7 ppm.

See also methyl group, which is a functional group similar to methane.

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