1. Multidisciplinary Nature of Environmental Science, Scope and Importance 2. Concept of Sustainability and Sustainable Development 3. Ecosystem 4. Natural Resources : Renewable and Non-Renewable Resources and Land Resources 5. Forest Resources : Deforestation 6. Water Resources 7. Energy Resources 8. Biodiversity and Its Conservation 9. Environmental Pollution 10. Environmental Policies and Practices 11. Human Community and Environment.