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- Sustainable development830
- Environmental policy127
- Sustainable agriculture120
- Economic development87
- Rural development62
- Environmental protection56
- Regional planning47
- Agriculture46
- Natural resources45
- Conservation of natural resources42
- Sustainable forestry39
- City planning34
- Globalization24
- Sustainable urban development24
- Biodiversity conservation23
- Community development22
- Indians of South America22
- Forest management21
- Poverty20
- Urbanization19