DANIEL B. BOTKIN,^* HENRIK SAXE,^** MIGUEL B. ARAÚJO,^*** RICHARD BETTS,^**** RICHARD H. W. BRADSHAW,^***** TOMAS CEDHAGEN,^****** PETER CHESSON,^******* TERRY P. DAWSON,^******** JULIE R. ETTERSON,^********* DANIEL P. FAITH,^********** SIMON FERRIER,^*********** ANTOINE GUISAN,^************ ANJA SKJOLDBORG HANSEN,^** DAVID W. HILBERT,^{*************} CRAIG LOEHLE,^{**************} CHRIS MARGULES,^{*************} MARK NEW,^{***************} MATTHEW J. SOBEL,^{****************} DAVID R. B. STOCKWELL<sup>*****************


*</sup>Daniel B. Botkin (e-mail: DanielBotkin@rcn.com) is a professor emeritus in the Department of Ecology, Evolution, and Marine Biology, University of California, Santa Barbara, CA 93106.
^**Henrik Saxe is chief consultant, and Anja Skjoldborg Hansen is a researcher, at the Environmental Assessment Institute, DK-1610 København V, Denmark.
^***Miguel B. Araújo is an associate professor in the Departamento de Biodiversidad y Biología Evolutiva, Museo Nacional de Ciencias Naturales, Consejo Superior de Investigaciones Científicas, 28006 Madrid, Spain.
^****Richard Betts is manager of climate impacts, Met Office Hadley Centre, Exeter EX1 3PB, United Kingdom.
^*****Richard H. W. Bradshaw is a professor in the Department of Geography, University of Liverpool, Liverpool L69 7ZT, United Kingdom.
^******Tomas Cedhagen is an associate professor in the Department of Marine Ecology, Institute of Biology, Aarhus University, Finlandsgade 14, DK-8200 Aarhus N, Denmark.
^*******Peter Chesson is a professor in the Department of Ecology and Evolutionary Biology, University of Arizona, Tucson, AZ 85721.
^********Terry P. Dawson is a university lecturer at the Centre for Environmental Change and Sustainability, University of Edinburgh, Edinburgh EH9 3JN, United Kingdom.
^*********Julie R. Etterson is an assistant professor in the Department of Biology, University of Minnesota, Duluth, MN 55812.
^**********Daniel P. Faith is principal research scientist at the Australian Museum, Sydney, New South Wales 2010, Australia.
^***********Simon Ferrier is principal research scientist in the New South Wales Department of Environment and Conservation, PO Box 402, Armidale 2350, Australia.
^************Antoine Guisan is an assistant professor in the Department of Ecology and Evolution, University of Lausanne, CH-1015 Lausanne, Switzerland.
^{*************}Chris Margules is leader of the Tropical Landscapes Program of the Sustainable Ecosystems Division at CISRO (Commonwealth Scientific and Industrial Research Organisation), and David W. Hilbert is principal research scientist and officer in charge, at the CSIRO Tropical Forest Research Centre, Atherton, Queensland 4883, Australia.
^{**************}Craig Loehle is principal reseach scientist at the National Council for Air and Stream Improvement, Naperville, IL 60540.
^{***************}Mark New is a university lecturer in the Climate Systems and Policy Group, Centre for the Environment, Oxford University, Oxford OX1 3QY, United Kingdom.
^{****************}Matthew J. Sobel is William E. Umstattd Professor in the Department of Operations, Weatherhead School of Management, Case Western Reserve University, Cleveland, OH 44106.
^{*****************}David R. B. Stockwell is a research scientist working jointly at the National Center for Ecological Analysis and Synthesis, University of California, Santa Barbara, CA 93101, and the San Diego Supercomputer Center, University of California–San Diego, La Jolla, CA 92093.