When pinning hopes on biofuels, an energy-hungry world must adapt to plant production capacities and resource limits Dr. Stephen R. Humphrey, Director, School of Natural Resources and Environment, Box 116455, 103 Black Hall, University of Florida Gainesville, FL 32611-6455 USA Tel. 352-392-9230, Fax 352-392-9748 http://snre.ufl.edu<http://snre.ufl.edu/>