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Topic
- Recycling 32
- Economics 28
- Demography 24
- Aquifers 23
- Water consumption 22
- Water reuse 22
- Sewage 6
- Water quality 4
- Hydrology 3
- Politics and government 3
- Resource allocation 3
- Technology 3
- Agriculture 2
- Contamination of environment 2
- Groundwater 2
- Hydrogeology 2
- Negotiation 2
- Saline water conversion 2
- Water diversion 2
- Animals 1
