Planet EarthThe 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