Stephen M. Gardiner is Professor of Philosophy and Ben Rabinowitz Endowed Professor of the Human Dimensions of the Environment at the University of Washington, Seattle. He is the author of A Perfect Moral Storm (Oxford, 2011), editor of Virtue Ethics, Old and New (Cornell, 2005), and co-editor of the Oxford Handbook of Environmental Ethics (Oxford, in press) and Climate Ethics: Essential Readings (Oxford, 2010). His research focuses on global environmental problems, future generations and virtue ethics. David Weisbach is the Walter J Blum Professor at the University of Chicago Law School and Senior Fellow at the University of Chicago Computation Institute and Argonne National Laboratories. Weisbach's research primarily focuses on issues related to taxation and on policy aspects of climate change. Weisbach received his BS in Mathematics from the University of Michigan in 1985; a Masters in Advance Study (Mathematics) from Wolfson College, Cambridge in 1986; and a JD from Harvard Law School in 1989. After graduating from law school, Weisbach clerked for Judge Joel M. Flaum of the U.S. Court of Appeals for the Seventh Circuit and worked as an associate in the law firm of Miller & Chevalier. In 1992, Weisbach joined the Department of Treasury where he worked as an attorney-advisor in the Office of the Tax Legislative Counsel and, subsequently, as associate tax legislative counsel. In 1996, Weisbach was appointed Associate Professor of Law at Georgetown Law Center and joined the Chicago faculty in 1998.