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 raw materials 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 bio-ethers, bioethanol, biodiesel, bio-methanol, and pyrolysis oils.