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Subject
- Oceans246
- Climatology, Meteorology and Atmosphere245
- Sea ice245
- Farming47
- Agriculture46
- Land use46
- Urbanization46
- Environment18
- Utilities and Communication12
- Inland Waters11
- Solar energy9
- Solar radiation9
- Administrative and political divisions6
- Biology and Ecology6
- Photovoltaic power generation6
- Watersheds5
- Boundaries4
- Hydrology4
- Location4
- Capitals (Cities)3