1. Visions of the Future. 2. Valuing the Environment: Concepts. 3. Valuing the Environment: Methods. 4. Property Rights, Externalities, and Environmental Problems. 5. Sustainable Development: Defining the Concept. 6. The Population Problem. 7. Natural Resource Economics: An Overview. 8. Energy. 9. Water. 10. Agriculture. 11. Biodiversity I: Forest Habitat. 12. Biodiversity II: Commercially Valuable Species. 13. Environmental Economics: An Overview. 14. Stationary-Source Local Air Pollution. 15. Acid Rain and Atmospheric Modification. 16. Transportation. 17. Water Pollution. 18. Solid Waste and Recycling. 19. Toxic Substances and Hazardous Wastes. 20. Development, Poverty, and the Environment. 21. The Quest for Sustainable Development. 22. Visions of the Future Revisited.