Argument: Cellulosic ethanol emits a lower net level of greenhouse gases
"Ethanol production." E85.whipnet.net: "Cellulosic ethanol also provides positive environmental benefits in the form of reductions in greenhouse gas emissions and air pollution."
"Igniting Cellulosic Biofuel Production." Science Progress. June 11th, 2008: "Cellulosic biofuels, unlike ethanol derived from corn starch, are made from the durable molecules—cellulose—that comprise the woody part of common plants. Not only does the production process result in less greenhouse gas emissions than the process for making ethanol from corn, there are hundreds of millions of tons of biomass feedstocks available every year in the U.S. for cellulosic ethanol that would otherwise be discarded as waste."