Categories
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The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- 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)
- WTO (4 members)
- WWU (5 members)
- Wales (3 members)
- Warfare and the Environment (6 members)
- Warsaw (1 member)
- Washington (182 members)
- Washington DC (6 members)
- Waste Management (5 members)
- Wastewater Treatment (13 members)
- Water (267 members)
- Water Pollution (56 members)
- Water Quality (499 members)
- Water Saving (99 members)
- Watersheds (46 members)
- West Virginia (33 members)
- Western Asia (6 members)
- Western Australia (4 members)
- Wetlands (154 members)
- Whole Earth (1,658 members)
- Wildlife (274 members)