1. Department of Environmental Science, Policy and Management; University of California; Berkeley; California; USA
2. Department of Ecology and Evolutionary Biology; Cornell University; Ithaca; New York; USA
3. Department of Environmental Sciences; University of Virginia; Charlottesville; Virginia; USA
4. Climate Change Unit, Institute for Environment and Sustainability; Ispra; Italy
5. Complex Systems Research Center; University of New Hampshire; Durham; New Hampshire; USA