Organic material produced by plants, animals, or microorganisms that can be burned directly as a heat source or converted into a gaseous or liquid fuel.
A renewable fuel derived from a living organism or the by product of a living organism. Biomass fuels include wood, dung, methane gas, and grain alcohol.
Biomass converted directly to energy or converted to liquid or gaseous fuels such as ethanol, methanol, methane, and hydrogen.