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Brazil uses sugar beet, which is a lot more efficient than corn. Thanks to the corn lobbyists, though, corn is all we've got. PP OT denizen red-beard has already presented calculations showing that biodiesel from corn would require every single acre of land in the US to make any meaningful dent in gasoline demand.

I believe hemp and sugar beet are both better suited for producing bio-fuels, but since when has the nation's policies been governed by common sense.