1. Department of Earth System Science, Stanford University, Stanford, California 94305;
2. Woods Institute for the Environment, Stanford University, Stanford, California 94305
3. Precourt Institute for Energy, Stanford University, Stanford, California 94305
4. Department of Crop and Soil Sciences, Oregon State University, Corvallis, Oregon 97331;
5. Department of Natural Resources and Environmental Management, University of Hawai'i at Mānoa, Honolulu, Hawai'i 96822;
6. Department of Physical Geography, Stockholm University, Stockholm SE-10691, Sweden;
7. School of the Environment, Washington State University Vancouver, Vancouver, Washington 98686;
8. IFEVA/CONICET, Facultad de Agronomía, Universidad de Buenos Aires, Buenos Aires C1417DSE, Argentina;
9. Facultad de Agronomía, Universidad de la República, Montevideo 12900, Uruguay