1. School of Population and Public Health and the W. Maurice Young Centre for Applied Ethics at the University of British Columbia, Vancouver, BC V6T 1Z4, Canada
2. School of Sustainability and School of Historical, Philosophical, and Religious Studies, Arizona State University, Tempe, AZ 85287
3. Philosophy and Environmental Resources Institute, University College Cork, Munster T12 K8AF, Ireland
4. Equity and Justice Group, International Institute for Applied Systems Analysis, Laxenberg, A-2361 Austria