1. Department of Earth System Science, University of California, Irvine, Irvine, California
2. Department of Atmospheric Sciences, University of Washington, Seattle, Washington
3. Department of Forest Resources, University of Minnesota, Twin Cities, St. Paul, Minnesota
4. Institute on the Environment, University of Minnesota, Twin Cities, St. Paul, Minnesota
5. Institute of Crop Science and Resource Conservation, University of Bonn, Bonn, Germany
6. Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, Massachusetts
7. Department of Earth and Planetary Sciences, Harvard University, Cambridge, Massachusetts