Environmental management Environmental protection 18 Environmental policy 17 Sustainable development 15 Pollution 13 Environmental economics 8 Sustainability 8 India 7 Natural Resource Economics, (New March 2000) 7 Global environmental change 6 Environmental chemistry 5 Environmental degradation 5 Environmental engineering 5 Land Resources 5 Natural resources 5 Air pollution 4 Case studies 4 Ecology 4 Ecotourism 4 Environmental Management 4 Environmental monitoring 4 Environmental sciences 4 Forest management 4 Global warming 4 Management 4 Tourism and Travel 4 Biodiversity 3 Conservation of natural resources 3 Environmental impact analysis 3 Forests 3