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- Sustainable development816
- Environmental policy123
- Sustainable agriculture118
- Economic development85
- Rural development60
- Environmental protection54
- Agriculture46
- Regional planning46
- Natural resources45
- Conservation of natural resources42
- Sustainable forestry38
- City planning33
- Globalization23
- Sustainable urban development23
- Biodiversity conservation22
- Community development22
- Indians of South America22
- Forest management20
- Ecotourism19
- Poverty19
