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- Saline water conversion 29
- Technology 16
- Economics 13
- Water quality 12
- Irrigation 10
- Politics and government 9
- Agriculture 8
- Hydrology 7
- Building 6
- Demography 6
- Resource allocation 6
- Aquifers 4
- Groundwater 4
- Peace 4
- Drinking water 3
- Recycling 3
- Sewage 3
- Water-supply 3
- Contamination of environment 2
- Electrodialysis 2