The International SCOPE Biofuels Project gratefully acknowledges support from the United Nations Foundation, Deutsche Forschungsgemeinschaft, the David & Lucile Packard Foundation, UNEP, the Cornell Center for a Sustainable Future, the Biogeochemistry & Biocomplexity Initiative at Cornell University, an endowment provided to Cornell University by David R. Atkinson, and the Wuppertal Institute for Climate, Environment, and Energy.