Methane's global warming potential.

Methane is a colorless, odorless gas with the molecular formula CH4. It is the main chemical component of natural gas (accounting for 70–90 percent of such gas). Natural gas makes up to 20 percent of the US energy supply. Methane was discovered by the Italian scientist Alessandro Volta, who collected it from marsh sediments and demonstrated that it was flammable. He called it “combustible air.”