1. Energy Analysis and Environmental Impacts Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
2. Energy and Biosciences Institute, University of California, Berkeley, Berkeley, California 94720, United States
3. Civil and Environmental Engineering Department, University of California, Berkeley, Berkeley, California 94720, United States
4. Department of Agricultural and Resource Economics, University of California, Berkeley, Berkeley, California 94720, United States
5. National Bureau of Economic Research, Cambridge, Massachusetts 02138, United States
6. Life Cycle, Economics and Agronomy Division, Joint BioEnergy Institute, Emeryville, California 94608, United States
7. Biological Systems and Engineering Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720 United States