1. Tsinghua-Berkeley Shenzhen Institute, Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, China
2. Life-cycle, Economics, and Agronomy Division, Joint Bioenergy Institute, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
3. Biological Systems and Engineering Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
4. Department of Civil and Environmental Engineering, University of California, Berkeley, California 94720, United States