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Subject (Region)
- European Union countries7
- United States7
- China5
- India3
- Arctic regions2
- Mexico2
- America1
- Aral Sea Watershed (Uzbekistan and Kazakhstan)1
- Asia1
- Asia, Central1
- Atlantic Ocean1
- Developing countries1
- Europe, Central1
- Europe, Eastern1
- Mekong1
- Mekong River Watershed1
- Nile River Watershed1
- North America1
- Pacific Area1
- Polar regions1