1. Bren School of Environmental Science & Management, University of California, 2400 Bren Hall, Santa Barbara, California 93106-5131, United States
2. National Renewable Energy Laboratory, Golden, Colorado 80401, United States
3. Industrial Ecology Programme, Department of Energy Process and Engineering, Norwegian University of Science and Technology (NTNU), Høgskoleringen 5, NO-7491 Trondheim, Norway