Natural resources India 33 Sustainable development 26 Environmental policy 24 Economics 19 Environmental economics 18 Agriculture 13 Human ecology 12 Management 11 Pollution 11 Ecology 10 Natural Resource Economics, (New March 2000) 10 Resource management 10 exports 10 imports 10 Conservation of natural resources 9 Economic development 9 Natural Resources (General) 8 Agricultural Economics 7 Biodiversity 7 Climatic changes 7 Land use 7 Rural development 7 Social Psychology and Social Anthropology, (New March 2000) 7 Sustainable agriculture 7 Conservation 6 Environmental protection 6 Forest policy 6 Remote sensing 6 Sustainability 6