http://www.energytribune.com/articles.cfm/7401/corn-based-ethanol-the%20real-cost
"Thanks to considerable improvements in productivity for corn and other crops, US planted land has decreased by 39 million acres since 1980 from about 356 to 317 million acres, an 11% decrease. Corn’s share increased from 23.6% to 27.8% (88 million acres) displacing 13.4 million acres of other crops (about 5.9% of the other crop total)."
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