Argument: Cellulosic biofuel production emits significant greenhouse gases
Elizabeth Rosenthal. "Biofuels Deemed a Greenhouse Threat". New York Times. February 8, 2008 - "if American corns fields of average yield were converted to switchgrass for [cellulosic] ethanol, replacing that corn would still trigger emissions from land use change that would take 52 years to pay back and increase emissions over 30 years by 50%."