The debate about the environmental impact of ethanol rages on. Last month, the most recent study on the greenhouse gas (GHG) emissions associated with ethanol use was published by researchers from the University of Nebraska (Liska et al.). That analysis used the most recent data available on individual facility operations and emissions, observed corn yields, nitrogen fertilizer emissions profiles, and co-product use; all of which prove important because of improved energy efficiencies associated with ethanol production over the past several years. The authors found that the total life-cycle GHG emissions from the most common type of ethanol processing facility in operation today are 48-59 percent lower than gasoline, one of the highest savings reported in the literature. Even without subtracting-out the GHG emissions associated with ethanol co-products (which accounted for 19-38 percent of total system emissions), ethanol would still present GHG advantages relative to gasoline.…