The 18th symposium of Enviroinfo 2004 will be held in Geneva, Switzerland, October 21-23, 2004, at the European Nuclear Research Center (CERN), celebrating its 50th anniversary. The conference theme is "Sh@ring" of information technologies, knowledge, and data for sustainable development. As a strategic partner, Esri, together with many United Nations organizations and European environmental ministers, invites you to submit an abstract. The deadline for submission is February 27, 2004 (www.enviroinfo2004.org).