1. Energy & Biosciences Institute, University of California, Berkeley, Berkeley, California 94704, United States
2. Life-Cycle, Economics, and Agronomy Division, Joint BioEnergy Institute, Emeryville, California 94608, United States
3. Biological Systems & Engineering Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
4. Energy Analysis & Environmental Impacts Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States