1 Science, Technology, and International Af airs Program, Edmund A. Walsh School of Foreign Service, Georgetown University, Washington, DC, USA. China Energy Group, Lawrence Berkeley National Laboratory, Berkeley, CA, USA. Joanna.Lewis@georgetown.edu.
2 China Energy Group, Lawrence Berkeley National Laboratory, Berkeley, CA, USA.
3 China Energy Group, Lawrence Berkeley National Laboratory, Berkeley, CA, USA. Energy and Resources Group, University of California, Berkeley, CA, USA.
4 Energy and Resources Group, University of California, Berkeley, CA, USA.