The Associated Press is reporting that a new research study claims that widespread ethanol production will lead to more global warming, due to an increased amount of land converted from forests and grassland into crop production. Researchers from Princeton University’s Woodrow Wilson School of Public and International Affairs estimated that using corn to produce ethanol will lead to an increase in greenhouse gases of 93%. The impact of using switchgrass to produce ethanol is less, but still significant. A spokesman for the Renewable Fuels Association called the study “simplistic.”