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Methane gas is a form of greenhouse gas that is over 20 times more effective than carbon dioxide in trapping heat in the atmosphere. Methane gas can remain in the atmosphere for about 9 to 15 years. Methane is emitted from a number of natural and human-influenced sources.ethane gas is a form of greenhouse gas that is over 20 times more effective than carbon dioxide in trapping heat in the atmosphere. Methane gas can remain in the atmosphere for about 9 to 15 years. Methane is emitted from a number of natural and human-influenced sources.
For the emergency service protocol, see ETHANE. Methane (US /ËmÉÎ¸eÉªn/ or UK /ËmiËÎ¸eÉªn/) is a chemical compound with the chemical formula CH4 (one atom of carbon and four atoms of hydrogen). It is a group 14 hydride and the simplest alkane, and is the main constituent of natural gas. The relative abundance of methane on Earth makes it an attractive fuel, though capturing and storing it poses challenges due to its gaseous state under normal conditions for temperature and pressure.