The conference took advantage of the confluence of meetings of the Royal Society of Canada, the Learned Societies of Canada, and the Canadian Federation of Biological Societies at Queen's University in Kingston, Ontario. Planet Earth, a compendium of papers presented at the conference, is the result. Contents Humankind: Agent and Victim of Global Change in the Geosphere-Biosphere System - Digby J. McLaren Our Common Future: World Development and the Environment - Alistair M. Taylor and Duncan M. Taylor Changes in Climates of the Past: Lessons for the Future - Michael B. McElroy World Hunger, Livelihoods, and the Environment - Gita Sen Species Impoverishment - M. Brock Fenton The Interface of Health, Population, and Development: The Ecology of Health - Rex Fendall Environmental Toxicology - Gabriel L. Plaa Aboriginal Peoples: The Canadian Experience? - Marlene Brant Castellano Science and Politics on Planet Earth - Michael Ignatieff.