JURGEN SCHMANDT is Professor Emeritus, Lyndon Baines Johnson School of Public Affairs, the University of Texas at Austin and Distinguished Fellow, Houston Advanced Research Center. GERALD R. NORTH holds the Harold Haynes Endowed Chair in Geosciences in the Department of Atmospheric Sciences at Texas A&M University. JUDITH CLARKSON works in environmental consulting, particularly on water-related projects, and writes and edits materials related to acid rain and climate change.