Abstract
Growing and harvesting corn as a source of ethanol for gasoline additives is not efficient and can lead to increased soil erosion (ChemWeb.com, 16 August). An agricultural scientist, David Pimentel, from Cornell University (Ithaca, NY, USA) who has previously chaired a US Department of Energy panel investigating the economic and environmental impact of ethanol production from crops, carried out a more detailed analysis of the panel's findings. He concluded that ∼70% more energy is required to produce one gallon of ethanol pure enough to be a fuel additive, than is actually produced when it is combusted. He also concluded that increasing corn harvesting to produce ethanol speeds up the rate of soil erosion and wastes a valuable human food source. MJD
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