Natural gas is methane (CH4), which can be sourced either from fossil fuel deposits (conventional natural gas) or by processing and capturing methane from the decomposition of food waste, sewage, refuse, or manure. This non-fossil, renewable natural gas is also referred to as biogas or biomethane.

Natural gas can be transported from its source to the point of use by pipeline as gas phase, or it can be cooled down until it liquefies into liquid natural gas (LNG) and moved by specialized trucks and ships.

Liquefied natural gas (LNG) has been cooled to a liquid state at about -160° degree celsius. The volume of natural gas in its liquid state is about 600 times smaller than its volume in its gaseous state in a natural gas pipeline

LNG is used in many business sectors within the industrial sector, road transport and marine.