With the new legislation, corn ethanol use would reach 15 billion gallons by 2015, a large increase considering that 20 percent of the American corn crop is already going into ethanol.
Energy experts are wondering if the new mandates can be achieved in the short time.
They also estimate that more than 100 additional corn ethanol plants will be required, and also at least 200 biomass fuel plants, and this could change.
A alliance of advocates and environmentalists has promoted biomass ethanol as an alternative to fossil fuels, saying it can reduce the country's reliance on imported oil and help slow global warming, especially if biomass sources like switch grass and trees that can be developed that would need little water and fertilizer to grow.
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