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Ethanol from sugarcane seems to be fairly effective in Brazil.
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"One farm for the local village probably makes sense," he says. "But if you have a 100,000 acre plantation exporting biomass on contract to Europe , that's a completely different story. From one square meter of land, you can get roughly one watt of energy. The price you pay is that in Brazil alone you annually damage a jungle the size of Greece ."
I've come to the conclusion that if we're smart about it, nuclear power plants may be the lesser of the evils when we compare them with coal-fired plants and their impact on global warming," he says. "We're going to pay now or later. The question is what's the smallest price we'll have to pay?"
Reference:
http://www.sciencedaily.com/releases...0329132436.htm