Gilberto Gallopín is Regional Adviser on Environmental Policies at the United Nations Economic Commission for Latin America and the Caribbean in Santiago, Chile. He received his Ph.D. in Ecology from Cornell University in 1969 and is an ecological systems analyst and sustainable development expert. He has worked on ecological systems analysis, food chain and niche theory, global modeling, environmental modeling, environmental impact assessment, environmental and land use prospective, the environment and development nexus, environment and quality of life, impoverishment and sustainable development, scenario analysis, and policy dialogues. He has published more than 100 papers in these areas. He is the editor of a book on ecological perspectives for Latin America, principal author of a book on problems and opportunities for sustainable development in Latin America and of a booklet on global scenarios and human choice, and co-author of the Latin American World Model and of a book on adaptive environmental impact assessment and management. Some of his relevant experience includes: Director of the Systems for Sustainable Development Programme, Stockholm Environment Institute; Leader of the Land Use Program of the International Center for Tropical Agriculture (CIAT), Cali, Colombia; Senior Fellow of the International Institute for Sustainable Development (IISD), Winnipeg, Canada; Senior Expert on Environment and Development in the International Institute for Applied Systems Analysis (IIASA), Austria; Full Professor at the University of Buenos Aires and at the Fundacion Bariloche, Argentina, as well as the Executive President of the latter.