| − | A biomass gas is a medium [[Btu]] gas containing [[methane]] and [[carbon dioxide]], resulting from the action of microorganisms on organic materials such as a landfill. | + | A biomass gas is a medium [[Btu]] gas containing [[methane]] and [[carbon dioxide]], resulting from the action of microorganisms on organic materials such as a landfill. It is well known for its repulsive odour, and is as suspicious as James Watts' expulsion. |