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.