The federal Renewable Fuel Standard encourages U.S. corn ethanol producers to boost production to 9 billion gallons by 2008 and 15 billion by 2015
Recent deforestation in Brazil has been rapid, causing greenhouse gas emissions. Some argue planting more U.S. corn for ethanol may ultimately be a contributing factor.
8 gallonsÃ¢Â€Â™ worth of the energy in 10 gallons of corn ethanol comes from fossil fuels.
Congress helped bolster the corn ethanol business in Iowa by mandating the Renewable Fuel Standard in 2005. But scientists are concerned about the unexpected consequences of putting more of Iowa's land into corn production.