1. Environmental Science Division, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, IL, USA.
2. Department of Physical Geography and Quaternary Geology, Stockholm University, Stockholm, Sweden.
3. Department of Geology and Environmental Science, University of Pittsburgh, Pittsburgh, PA, USA.
4. State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, 100093 Beijing, China.
5. Permafrost Research Section, Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Potsdam, Germany.
6. Institute of Physico-Chemical and Biological Problems in Soil Science, Russian Academy of Sciences, Puschchino, Russia.
7. School of Earth, Energy and Environmental Sciences, Stanford University, Stanford, CA, USA.
8. Institute of Arctic Biology, University of Alaska Fairbanks, P.O. Box 757000, Fairbanks, AK, USA.
9. Palmer Research Center, University of Alaska Fairbanks, Palmer, AK, USA.
10. Earth and Environmental Sciences, Lawrence Berkeley National Laboratory, Berkeley, CA, USA.
11. Center for Ecosystem Science and Society, Northern Arizona University, Flagstaff, AZ, USA.
12. Department of Ecology and Environmental Sciences, Umea University, Sweden.
13. Biological Station, University of Michigan, Pellston, MI, USA.
14. Department of Geography and Environment, Northumbria University, Newcastle upon Tyne, UK.
15. Institute of Soil Science, Center for Earth System Research and Sustainability (CEN), Universität Hamburg, Hamburg, Germany.
16. Climate Change Institute, Oak Ridge National Laboratory, Oak Ridge, TN, USA.
17. Department of Civil and Environmental Engineering, University of Tennessee, 325 John D. Tickle Building, 851 Neyland Drive, Knoxville, TN, USA.
18. CENPERM (Center for Permafrost), Department of Geosciences and Natural Resource Management, University of Copenhagen, Copenhagen, Denmark.
19. Earth and Oceanographic Science Department and Environmental Studies Program, Bowdoin College, Brunswick, ME, USA.