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solid, liquid, or gaseous fuels derived from plants and algae. Three common strategies are used to produce liquid biofuels. 1. Biodiesel is made by chemically reacting oils from crops like soybean or algae with methanol. 2. Bioethanol is made by fermenting sugars or starches from crops like sugar cane and corn. 3. Cellulosic ethanol is made by gasifying (or more recently by fermenting) plant waste or nonfood crops. Biofuels made from crop waste or from perennial plants grown on degraded and abandoned agricultural lands offer immediate and sustained greenhouse gas advantages. See also feedstocks.

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