1. My thanks to Nives Dolsak, Leslie Francis, Robert Frodeman, Robert Goldberg, Dale Jamieson, Chaone Mallory, Holmes Rolston III, Mike White, the 2006-2007 Tanner Humanities Center fellows, the Editors ofPhilosophy & Public Affairs, and participants at the following venues for valuable comments: my Tanner talk, the 2007 Ethics and Climate Change conference at the University of Washington, and the 2006 Joint ISEE/IAEP conference. Thanks also to Robert Adler, Elijah Millgram, and Amy Wildermuth for helpful discussion. A Virgil Aldrich fellowship, from the Tanner Humanities Center at the University of Utah, provided me with research leave; I gratefully acknowledge the support.
2. The Tragedy of the Commons
3. Extensions of "The Tragedy of the Commons"
4. The Tragedy of the Commons 30 Years Later