Link2Energy (United Kingdom)

Natural gas consists primarily of methane, typically with 0–20% higher hydrocarbons. It is always associated with other hydrocarbon fuel, in coal beds, as methane clathrates, and is an important fuel source and a major feedstock for fertilizers. Natural gas is commercially extracted from oil fields and natural gas fields. Gas extracted from oil wells is called associated gas. The natural gas industry is extracting gas from increasingly more challenging resource types: sour gas, tight gas, shale gas, and coalbed methane. In fact, methane can also be produced from landfill site or anaerobic digestion, which is called biogas, it is in fact a kind of young age natural gas.