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Topic
- Recycling 35
- Economics 29
- Aquifers 25
- Demography 25
- Water consumption 24
- Water reuse 23
- Sewage 6
- Water quality 5
- Groundwater 4
- Hydrology 4
- Contamination of environment 3
- Politics and government 3
- Resource allocation 3
- Technology 3
- Agriculture 2
- Hydrogeology 2
- Negotiation 2
- Saline water conversion 2
- Water diversion 2
- Animals 1
