1. School
of Earth, Energy, and Environmental Sciences, Stanford University, Stanford, California 94305, United States
2. Nicholas
School of the Environment and Center on Global Change, Duke University, Durham, North Carolina 27708, United States
3. Office
of Energy Policy and Systems Analysis, U.S. Department of Energy, Washington,
DC 20002, United States
4. Gas Safety, Inc., Southborough, Massachusetts 01772, United States
5. School
of Environment and Natural Resources, OARDC, The Ohio State University, Wooster, Ohio 44691, United States
6. Department
of Earth and Environment, Boston University, Boston, Massachusetts 02215, United States
7. Woods
Institute for the Environment, and Precourt Institute for Energy, Stanford University, Stanford, California 94305, United States