1 Institute of Integrative Biology, ETH Zurich, Universitätstrasse 16, 8006 Zürich, Switzerland.
2 Natural Resource Ecology Laboratory, 1 499 Campus Delivery, Colorado State University, Fort Collins, Colorado 80523-1499, USA.
3 Division of Math and Science, Babson College, Massachusetts 02457, USA.
4 Department of Earth System Science, University of California Irvine, Irvine, California 92697, USA.
5 Department of Ecology & Evolutionary Biology, University of California Irvine, Irvine, California 92697, USA.
6 Division of Biology, Kansas State University, Manhattan, Kansas 66506, USA.
7 Institute of Ecology & Evolution, University of Oregon, Eugene, Oregon 97403, USA.
8 School of Forest Resources & Environmental Science, Michigan Technological University, Houghton, Michigan 49931, USA.
9 Centre for Carbon, Water & Food, The University of Sydney, Camden, 2570 New South Wales, Australia.
10 Center for Permafrost (CENPERM), Department of Geosciences and Natural Resource Management, University of Copenhagen, Øster Voldgade 10, 1350 Copenhagen K., Denmark.
11 CSIC, Global Ecology Unit CREAF-CSIC-UAB, Cerdanyola del Vallès, 08193 Catalonia, Spain.
12 CREAF, Cerdanyola del Vallès, 08193 Catalonia, Spain.
13 Department of Geosciences & Natural Resource Management, University of Copenhagen, Rolighedsvej 23, 1958 Frederiksberg C, Denmark.
14 Department of Forest Ecology & Management, Swedish University of Agricultural Sciences, 90183 Umeå, Sweden.
15 Department of Geography, National University of Singapore, 1 Arts Link, 117570, Singapore.
16 Institute of Soil Science & Land Evaluation, University of Hohenheim, 70593 Stuttgart, Germany.
17 Odum School of Ecology, University of Georgia, Athens, Georgia 30601, USA.
18 Key Laboratory of Ecosystem Network Observation & Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, 100101, China.
19 Institute of Ecology & Botany, MTA Centre for Ecological Research, 2-4. Alkotmany U., Vacratot, 2163-Hungary.
20 Department of Natural Resources & the Environment, University of New Hampshire, Durham, New Hampshire 03824, USA.
21 School of Forestry & Environmental Studies, Yale University, 195 Prospect Street, New Haven, Connecticut 06511, USA.