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At first glance, ethanol looks like a cure to all of America's energy woes. Since it's made from plants, it's a renewable resource. And advocates say that the clean-burning fuel can help the country become less dependent on foreign sources of oil. Just consider Brazil the country became energy-independent last year, due in large part to its 30-year effort to make more ethanol out of sugar cane. These

byMatthew Enis