Biofuel crops greenhouse gases
Studies report that more greenhouse gases are released when clearing land to grow current biofuel crops than would be reduced when the biofuels displaced fossil fuels.
The World Watch Institute, 2009 State of the World: Into a Warming World (Print Publication). A Worldwatch Institute Report on Progress Toward a Sustainable Society. ed. Linda Starke. Published by W.W. Norton & Company in New York, NY. page xxii.