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Topic
- Recycling 46
- Economics 32
- Water consumption 26
- Aquifers 25
- Demography 25
- Water reuse 23
- Water quality 13
- Hydrology 7
- Technology 7
- Groundwater 6
- Saline water conversion 6
- Sewage 6
- Agriculture 5
- Contamination of environment 5
- Politics and government 5
- Irrigation 4
- Resource allocation 4
- Building 3
- Droughts 3
- Negotiation 3