Biofuels are gas or liquid fuel (alcohols, ethers, esters, and other chemicals) made from plant material, agricultural and forestry residues, and a large portion of municipal solid and industrial waste. Biofuels include material as diverse as wood, wood waste, peat, wood sludge, agricultural waste, stray, sludge waste, municipal solid waste, landfill gases… Biofuels for transportation include bioethanol, biodiesel, biomethanol, and pyrolysis oils.