References http://www.grain.org/front/ http://www.grain.org/agrofuels/ http://www.grain.org/seedling_files/seed-07-07-2-en.pdf "Even if the USA's entire corn and soya harvests were used to produce agrofuels, they would satisfy only 12 per cent of the USA's current thirst for petrol and 6 per cent of its need for diesel. The situation in Europe is even worse: the UK, for example, could not grow enough agrofuels to run all its cars even if it put the whole country under the plough." MIT lifecycle analysis (Groode and Heywood): http://lfee.mit.edu/metadot/index.pl?id=2234 Alex Farrell, Science, DOI:10.1126/science.1121416 H. Shapouri, J.A. Duffield, and Michael S. Graboski, Estimating the Net Energy Balance of Corn Ethanol United States Department of Agriculture, Agricultural Economic Report Number 721