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Biofuels Energy from plant matter. There is a limited place for this in a sustainable energy system; managed woodland for burning fuel, conversion of waste products to liquid fuels, and perhaps a small amount of cropland for biofuel to allow aviation in the low carbon world. If land is used for biofuel crops instead of food crops, the nutritional sacrifice is huge for just a small contribution to the world's energy supply. An explosion in biofuels as a replacement for oil would present a real threat to global nutrition. (See Are biofuels bonkers?,