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In page Food vs. fuel:

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Two-thirds of U.S. oil consumption is due to the transportation sector.[9] The Energy Independence and Security Act of 2007 has a significant impact on U.S. Energy Policy.[10] With the high profitability of growing corn, more and more farmers switch to growing corn until the profitability of other crops matches that of corn. So the ethanol/corn subsidies drive up the prices of other farm crops.[citation needed]