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Topic
- Recycling 49
- Economics 33
- Water consumption 26
- Aquifers 25
- Demography 25
- Water reuse 23
- Water quality 15
- Hydrology 8
- Technology 8
- Agriculture 7
- Groundwater 7
- Saline water conversion 7
- Sewage 6
- Contamination of environment 5
- Irrigation 5
- Politics and government 5
- Building 4
- Resource allocation 4
- Droughts 3
- Electrodialysis 3