For 10 points, identify this substance, often found alongside petroleum deposits, which is comprised primarily of methane and provides a low-pollution energy source.
In August 2009, a sixty billion dollar contract to harvest this substance in Australia, in an operation known as the "Gorgon Project," was signed by Japan, South Korea, and a US energy company. All cars sold in Iran can run on this (*) energy source, which also powers about a fifth of public buses in Washington, D.C. For 10 points, identify this substance, often found alongside petroleum deposits, which is comprised primarily of methane and provides a low-pollution energy source.
In August 2009, a sixty billion dollar contract to harvest this substance in Australia, in an operation known as the "Gorgon Project," was signed by Japan, South Korea, and a US energy company.
{natural gas}