green energy sources
"With more research and incentives, we can break our dependence on oil with biofuels, and become the first country to have a million electric vehicles on the road by 2015," the president said in his speech to members of Congress. "[I]nstead of subsidizing yesterday's energy, let's invest in tomorrow's."
This commitment to clean energy investment increases the importance of biofuels like ethanol, made from corn and other agricultural products. About 40% of U.S. corn is used to make ethanol, and increased ethanol production leads to higher corn and food prices.