Natural Resource Economics, (New March 2000) 58 Sustainability 33 Policy and Planning 24 Natural resources 21 Tourism and Travel 21 Leisure, Recreation and Tourism Economics, (New March 2000) 19 Social Psychology and Social Anthropology, (New March 2000) 19 Environmental impact 17 Agricultural Economics 16 Environmental policy 16 Case studies 15 Land Resources 14 Water Resources 13 Ecotourism 12 Resource management 11 Community Participation and Development, (New March 2000) 10 Environmental economics 10 Natural Resources (General) 10 Pollution and Degradation 10 Economic impact 9 Forests 9 Forests and Forest Trees (Biology and Ecology) 9 Tourism 9 Agricultural development 8 Agriculture 8 Biological Resources (General) 8 Management 8 Nature conservation 8 Planning 8 Sustainable development 8