Methane
From PiqqoWiki
Methane, a greenhouse gas, comes from landfills, natural gas and oil production, and cattle ranching. But it’s also a good source of energy.
Methane is a chemical compound with the molecular formula CH4. It is the simplest alkane, and the principal component of natural gas. Methane's bond angles are 109.5 degrees. Burning methane in the presence of oxygen produces carbon dioxide and water. The relative abundance of methane and its clean burning process makes it a very attractive fuel.