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- Droughts 75
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- Irrigation 27
- Climate 21
- Politics and government 17
- Water consumption 16
- Technology 15
- Bureaucracy 13
- Economics 13
- Groundwater 12
- Hydrology 12
- Aswan High Dam (Egypt) 10
- Dams 10
- Water-supply 8
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- Demography 6
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- Water quality 6
- Water-power 6
