Edward A. G. Schuur,^* James Bockheim,^** Josep G. Canadell,^*** Eugenie Euskirchen,^**** Christopher B. Field,^***** Sergey V. Goryachkin,^****** Stefan Hagemann,^******* Peter Kuhry,^******** Peter M. Lafleur,^********* Hanna Lee,^* Galina Mazhitova,^********** Frederick E. Nelson,^*********** Annette Rinke,^************ Vladimir E. Romanovsky,^{*************} Nikolay Shiklomanov,^*********** Charles Tarnocai,^{**************} Sergey Venevsky,^{***************} Jason G. Vogel,^* Sergei A. Zimov<sup>****************


*</sup>Edward A. G. Schuur (e-mail: tschuur@ufl.edu), Hanna Lee, and Jason G. Vogel are with the Department of Botany at the University of Florida.
^**James Bockheim is with the Department of Soil Science at the University of Wisconsin.
^***Josep G. Canadell is with the Global Carbon Project, Division of Marine and Atmospheric Research, CSIRO, in Australia.
^****Eugenie Euskirchen is with the Institute of Arctic Biology, at the University of Alaska Fairbanks.
^*****Christopher B. Field is with the Department of Global Ecology, Carnegie Institution, at Stanford University, Palo Alto, California.
^******Sergey V. Goryachkin is with the Institute of Geography, at the Russian Academy of Sciences, Russia.
^*******Stefan Hagemann is with the Land in the Earth System Department at the Max-Planck Institute for Meteorology in Germany.
^********Peter Kuhry is with the Department of Physical Geography and Quaternary Geology at Stockholm University in Sweden.
^*********Peter M. Lafleur is with the Department of Geography at Trent University in Canada.
^**********Galina Mazhitova is with the Komi Science Centre, at the Russian Academy of Sciences, Russia.
^***********Frederick E. Nelson and Nikolay Shiklomanov are with the Department of Geography at the University of Delaware.
^************Annette Rinke is with the Alfred Wegener Institute for Polar and Marine Research in Germany.
^{*************}Vladimir E. Romanovsky is with the Geophysical Institute, at the University of Alaska Fairbanks.
^{**************}Charles Tarnocai is with the research branch of Agriculture and Agri-Food Canada in Ottawa.
^{***************}Sergey Venevsky is with the School of Geography at the University of Leeds, United Kingdom.
^{****************}Sergei A. Zimov is with the Northeast Science Station at the Russian Academy of Sciences, Russia.