6.1 Elementary Idea on Sustainable Development6.1.1 Concept of Sustainable Development6.2 Urban Problems Related to Energy6.3 Water Conservation6.3.1 Rain Water Harvesting6.3.2 Watershed Management6.4 Wasteland Reclamation6.5 Resettlement and Rehabilitation6.6 Air Pollution and the Biosphere6.6.1 Climate Changes6.7 Nuclear Accidents and the Holocaust6.8 Consumerism and Waste Products6.9 Laws Relating to Environment, Pollution, Forest and Wildlife6.10 Environmental Impact Assessment6.11 Precautionary Principle