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- Famines 11
- Politics and government 4
- Demography 3
- Droughts 3
- Precipitation (Meteorology) 3
- Rivers 3
- Agriculture 2
- Climate 2
- Commerce 2
- Contamination of environment 2
- Economics 2
- Finance 2
- Floods 2
- Food 2
- Irrigation 2
- Technology 2
- Children--Mortality 1
- Conflict management 1
- Dams 1
- Deforestation 1
