1. Energy Technologies Area, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California 94720, United States
2. Department of Civil and Environmental Engineering, University of California, Berkeley, Berkeley, California 94720, United States
3. Agriculture and Resource Economics Department, University of California, Davis, One Shields Avenue, Davis, California 95616, United States
4. Biosciences Area, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California 94720, United States
5. Joint BioEnergy Institute, 5885 Hollis Street, Emeryville, California 94720, United States