<P> Landfill gas is a complex mix of different gases created by the action of microorganisms within a landfill . Landfill gas is approximately forty to sixty percent methane, with the remainder being mostly carbon dioxide . Trace amounts of other volatile organic compounds (VOCs) comprise the remainder (<1%). These trace gases include a large array of species, mainly simple hydrocarbons . </P> <P> Landfill gases have an influence on climate change . The major components are CO and methane, both of which are greenhouse gas . In terms of global warming potential, methane is over 25 times more detrimental to the atmosphere than carbon dioxide . Landfills are the third largest source of methane in the US . </P>

What type of gas is released in landfills (methane or co2
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