Topic
- Drinking water 35
- Canals 32
- Sewage 32
- Climate 31
- Droughts 31
- Precipitation (Meteorology) 31
- Commerce 29
- Population 29
- Foreign relations 27
- United States. Agency for International Development 27
- Aquifers 26
- Industries 26
- Resource allocation 25
- Soils 25
- World Bank 23
- Armed Forces 22
- Contamination of environment 22
- Investments, Foreign 22
- Saline water conversion 21
- Jonglei Canal (South Sudan) 19