call -151 writes "Yahoo reports this story by researchers from Cornell and Berkeley who show what a number of people had suspected- it takes significantly more energy (at least 29%) more energy to produce ethanol than it yields. Since ethanol production plants don't use ethanol themselves for their own energy needs (with presumably negible delivery costs) this has been widely suspected but not so bluntly stated: "Ethanol production in the United States does not benefit the nation's energy security, its agriculture, the economy, or the environment." Ethanol producers dispute the study, predictably, which deducts the multi-billion US dollar subsidy. It's not clear how this compares with this earlier Union of Concerned Scientists article that claims that the yield from corn kernels is net 50% positive- and the UCS is usually quite unbiased on these things."
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