| http://www.w3.org/ns/prov#value | - According to FAO (2007a), biofuels are classified as solid fuels, biogas, liquid fuels such as bioethanol and biodiesel, which come from crops such as sugar cane and beet, maize and energy grass or from fuelwood, charcoal, agricultural wastes and by-products, forestry residues, livestock manure and other sources.
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