Gas is a fossil fuel and thus is a finite resource. It is estimated that if current rates of production and consumption remain constant, the world's known conventional natural gas reserves could run out at some point in the 2070s. In 2008, the UK's own known reserves of natural gas were estimated at 907 billion cubic metres.
These are the quantity of supply challenges facing gas. Read about the possible solutions.
Find out more about gas as a means of generating electricity.