DIANE E. PATAKI,^* DAVID S. ELLSWORTH,^** R. DAVE EVANS,^*** MIQUEL GONZALEZ-MELER,^**** JOHN KING,^***** STEVEN W. LEAVITT,^****** GUANGHUI LIN,^******* ROSER MATAMALA,^******** ELISE PENDALL,^********* ROLF SIEGWOLF,^********** CHRIS VAN KESSEL,^*********** JAMES R. EHLERINGER<sup>*


*</sup>Diane E. Pataki (pataki@biology.utah.edu) is a science officer and James R. Ehleringer is a Focus 1 leader for the International Geosphere–Biosphere Programme's GCTE (Global Change and Terrestrial Ecosystems) Focus 1 project. Pataki and Ehleringer are also professors in the Department of Biology, University of Utah, Salt Lake City, UT 84112.
^**David S. Ellsworth is a professor in the School of Natural Resources and Environment, University of Michigan, Ann Arbor, MI 48109.
^***R. Dave Evans is a professor in the School of Biological Sciences, Washington State University, Pullman, WA 99164.
^****Miquel Gonzalez-Meler is a professor in the Department of Biological Sciences, University of Illinois, Chicago, IL 60607.
^*****John King is a professor in the School of Forest Resources and Environmental Science, Michigan Technological University, Houghton, MI 49931.
^******Steven W. Leavitt is a professor in the Laboratory of Tree-Ring Research, University of Arizona, Tuscon, AZ 85721.
^*******Guanghui Lin is an associate research scientist in the Biosphere 2 Center, Columbia University, Oracle, AZ 85623.
^********Roser Matamala is a researcher in the Environmental Research Division, Argonne National Laboratory, Argonne, IL 60439.
^*********Elise Pendall is a professor in the Department of Botany, University of Wyoming, Laramie, WY 82071.
^**********Rolf Siegwolf is head of Stable Isotopes and Ecosystem Fluxes in the Laboratory of Atmospheric Chemistry, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland.
^***********Chris van Kessel is a professor and agronomist in the Department of Agronomy and Range Science, University of California, Davis, CA 95616.