Robert W. Howarth,^* Elizabeth W. Boyer,^** Wendy J. Pabich,^*** James N. Galloway<sup>****


*</sup>Robert W. Howarth is the David R. Atkinson Professor of ecology and environmental biology at Cornell University and an adjunct scientist in Woods Hole, MA. He is editor-in-chief of Biogeochemistry and was co-chair of the International SCOPE Nitrogen Project from 1993–2001. His address is The Ecosystems Center, Marine Biological Laboratory, Woods Hole, MA 02543, USA.rwh2@cornell.edu
^**Elizabeth W. Boyer is an assistant professor of watershed hydrology at the State University of New York, and holds adjunct positions at Cornell University and at Syracuse University. Her address: State University of New York, College of Environmental Science & Forestry, 1 Forestry Drive, Syracuse, NY 13210, USA.ewboyer@syr.edu.
^***Wendy J. Pabich is a staff scientist with the Oceans Program at Environmental Defense in Boston, MA. Her address: Environmental Defense, 18 Tremont Street, Suite 850, Boston, MA 02108, USA.wpabich@edf.org.
^****James N Galloway is professor of environmental sciences at the University of Virginia, USA. His research on biogeochemistry includes the natural and anthropogenic controls on chemical cycles at the watershed, regional and global scales. His current research focuses on beneficial and detrimental effects of reactive nitrogen as it cascades among environmental reservoirs in the atmosphere and biosphere of the Earth. His address: Department of Environmental Sciences, University of Virginia, Charlottesville, VA 22903, USA.jng@virginia.edu