To: RetiredNow who wrote (294722 ) 7/14/2006 11:03:01 AM From: Road Walker Respond to of 1572332 Study calls for better green fuel alternatives By Mark Weinraub Thu Jul 13, 4:23 PM ET Fuels produced from corn and soybeans offer clear economic and environmental advantages over fossil fuels but scientists should still work to develop even cleaner alternative energy sources that do not sap the world's food supplies, a study said. "There is a great need for renewable energy supplies that do not cause significant environmental harm and do not compete with the food supply," said the study published online this week in the Proceedings of the National Academy of Sciences. The study by the University of Minnesota and St. Olaf College in Northfield, Minnesota examined the amount of energy soybean and corn fuels produced in relation to the energy it took to produce them. It also looked at the environmental impact of the fuels. Researchers of the study found that soybean-based biodiesel is more efficient than corn-based ethanol in spite of recent excitement surrounding ethanol. "Among current food-based biofuels, soybean biodiesel has major advantages over corn grain ethanol," the study said. Biodiesel yields 93 percent more energy than it takes to produce, well above ethanol's 25 percent yield. The production of soybean-based biodiesel emitted 41 percent less greenhouse gases than the fossil fuel process, while ethanol production's greenhouse gas emissions were 12 percent lower than for fossil fuels. But growing soybeans and corn can cause harm to the environment through the application of pesticides and the use of nitrogen-based fertilizers. Additionally, corn and soybean-based fuels will not be able to satisfy the demand for transportation without compromising the food supply around the world. Ethanol currently has the clear lead in the alternative fuels race in the United States. Companies are spending billions of dollars to build ethanol production plants. Some forecasters are predicting the demand for corn will exceed the amount grown in coming years because of ethanol. The U.S. Agriculture Department pegged the amount of corn in the United States at the end of the current marketing year on August 31 at 2.062 billion bushels, but by next year the supply was expected to be cut in half to just over 1.0 billion bushels. But some analysts said the numbers did not factor in an accurate forecast for ethanol usage.