
Natural gas is a finite resource. Once it is depleted, it cannot be renewed. It is extracted from coal beds and consists primarily of methane. Methane is 72 times worse than carbon dioxide — the most well-known carbon pollutant — as a greenhouse gas.
The City of Sydney plans to use natural gas as the primary fuel to transition away from coal-fired electricity towards low-carbon energy by using a method of energy production known as trigeneration.