Although the US and other nations currently produce ethanol from the sugars and starches of crops like sugar cane and corn, ethanol isn't a good match for our existing fuel infrastructure—and this form of production runs the risk of putting energy in competition with food production for resources like land and water. As a result, attention has shifted to figuring out how to produce a new generation of biofuels from different sources that more closely approximate the diesel and gasoline in use today.
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Source: Ars Technica
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