It has also been detected on other planets, including Mars, which has implications for astrobiology research. The Earth's atmospheric methane concentration has increased by about 150% since 1750, and it accounts for 20% of the total radiative forcing from all of the long-lived and globally mixed greenhouse gases. When methane reaches the surface and the atmosphere, it is known as atmospheric methane. The largest reservoir of methane is under the seafloor in the form of methane clathrates.
Naturally occurring methane is found both below ground and under the seafloor and is formed by both geological and biological processes. The relative abundance of methane on Earth makes it an economically attractive fuel, although capturing and storing it poses technical challenges due to its gaseous state under normal conditions for temperature and pressure. It is a group-14 hydride, the simplest alkane, and the main constituent of natural gas. Methane ( US: / ˈ m ɛ θ eɪ n/ MEH-thayn, UK: / ˈ m iː θ eɪ n/ MEE-thayn) is a chemical compound with the chemical formula CH 4 (one carbon atom bonded to four hydrogen atoms).
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