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Environment
Ethanol costs
October 23, 2006
| A version of this story appeared in
Volume 84, Issue 43
Sept. 18, page 16. Vitamin C was incorrectly identified as citric acid. It is ascorbic acid.
Oct. 9, page 12. The article on brain chemistry should have included the following reference information for the work cited: Science 2006, 314, 130.
The claim that ethanol yields 25% more energy than the fossil fuels (including electricity) invested in producing it through corn is at odds with well-reviewed studies such as those by David Pimentel and by Ted W. Patzak, which show, to the contrary, that producing ethanol through corn consumes 29% more fossil fuel energy than is in the ethanol (C&EN, July 24, page 27). Beware of ethanol energy calculations offered up from corn-producing states or, these days, from government agencies such as the Department of Agriculture or the Department of Energy.
George R. Lester
Salem, Va.
The power is now in your (nitrile gloved) hands
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