After discovering the disastrous consequences of turning its own food crops into fuel, China has turned to cassava -- mostly from southeast Asia -- as a source for biofuels. Europe, meanwhile, is buying up tracts of "marginal land" in Africa in order to grow jatropha for biofuels. In the U.S., of course, it's corn for ethanol. The developed world's modest proposal is this: Take calories that might otherwise have gone to feed humans or their livestock, and turn them into energy to fuel our motor vehicles instead. In theory, say advocates of biofuel, next-generation fuels will be made from crops …
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