grainIncreased interest in alternative fuel is spotlighting a new battlefield: biodiesel.

U.S. growers of biodiesel crops such as soybeans were outraged when they heard that a shipment of imported biodiesel from South America qualified for tax breaks.

"Why would we want to trade our farmers, our jobs, our communities, our tax dollars and our energy security for another dependence on foreign ethanol or biofuels?" said Minnesota Farmers Union President Doug Peterson.

The importers (mostly U.S.-based companies) counter that the farmers have been reaping the benefits of government protection for years.

Competition could be the best indicator yet that alternative fuels are hitting the mainstream.

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