Helen Hazen is a teaching professor at the University of Denver. After completing an undergraduate degree in geography at Oxford University, she worked in the field of environmental conservation before earning a Ph.D. in geography from the University of Minnesota. Dr. Hazen has published on a variety of aspects of human-environment interactions, including the role of the World Heritage Program in environmental protection and biases in ecosystem protection. Her teaching interests focus on health, environment, and sustainability and have led to the publication of undergraduate textbooks in health geography and population geography.

Paul Sutton is a professor in the Department of Geography and the Environment at the University of Denver. Dr. Sutton is also a member of the board of trustees for the small town of Morrison, CO (pop ~350). He also serves on the board of the Denver Regional Council of Governments. Dr. Sutton obtained his B.S. from Union College in Chemistry, his M.A. in Statistics and PhD in Geography from UCSB. His research interests are in the general area of human-environment relations with a particular interest in population geography, sustainability science, and ecological economics.

'1. Introduction to Sustainability and the Human-Environment System. 2. Biophysical Perspectives on Sustainability. 3. Population and Consumption. 4. Economic Perspectives on Sustainability. 5. Ethical Approaches to Sustainability. 6. Earth's Atmosphere. 7. Oceans. 8. Fresh Water. 9. Wildlands. 10. Agriculture. 11. Urban Systems. 12. Conclusion.