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Topic
- Desertification 21
- Agriculture 12
- Hydrology 9
- Demography 7
- Irrigation 7
- Watersheds 5
- Groundwater 4
- Precipitation (Meteorology) 4
- Climate 3
- Contamination of environment 3
- Economics 3
- Technology 3
- Water quality 3
- Bureaucracy 2
- Finance 2
- Health 2
- Livestock 2
- Population 2
- Rain and rainfall 2
- Soils 2
