Categories
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The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Tidal Power (2 members)
- Togo (1 member)
- Tompkins County (10 members)
- Tonga (1 member)
- Topic (125 members)
- Toronto (34 members)
- Townships (15 members)
- Toxics and Pollution (117 members)
- Transportation (276 members)
- Trees and Forests (62 members)
- Tribal Governing Bodies (7 members)
- Trinidad and Tobago (1 member)
- Trucost (11 members)
- Tunisia (1 member)
- Turkey (1 member)
- Turkmenistan (1 member)
- Tuvalu (2 members)
- UC Berkeley (5 members)
- UK (78 members)
- US (776 members)
- US Environmental Protection Agency (830 members)
- Uganda (1 member)
- Ukraine (73 members)
- United Arab Emirates (26 members)
- United Kingdom (27 members)
- United Nations (570 members)
- United Nations Development Group (10 members)
- United Nations Economic and Social Council (10 members)
- United Nations Framework Convention on Climate Change (59 members)
- United States (162 members)
- Univ of Buffalo (5 members)
- Univ of Montana (7 members)
- Urban Gardening (46 members)
- Uruguay (1 member)
- Utah (16 members)
- Uzbekistan (1 member)
- Vanuatu (2 members)
- Vatican City (1 member)
- Venezuela (4 members)
- Vermont (21 members)
- Victoria (7 members)
- Vietnam (11 members)
- Virginia (23 members)
- Virtual Earth (87 members)
- Virtual Planet (97 members)
- Virtual Reality (18 members)
- Visual Pollution (5 members)
- Voting (99 members)
- Voting Rights (106 members)
- Voting Systems (103 members)