1. Environmental Defense Fund, 301 Congress Avenue, Suite 1300, Austin, Texas 78701, United States
2. Environmental
Dynamics Program, University of Arkansas, Fayetteville, Arkansas 72701, United States
3. Department of Energy Resources Engineering, Stanford University, Stanford, California 94305, United States
4. Department of Earth System Science, Woods
Institute for the Environment, and Precourt Institute for Energy, Stanford University, Stanford, California 94305, United States