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The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Taos (11 members)
- Tasmania (10 members)
- Tax-Related (18 members)
- Tennessee (43 members)
- Texas (84 members)
- Thailand (2 members)
- Thermal Pollution (5 members)
- ThinBlueLayer (667 members)
- Think Tank (1 member)
- Threat Multiplier (547 members)
- Tidal Power (2 members)
- Togo (1 member)
- Tompkins County (10 members)
- Tonga (1 member)
- Topic (122 members)
- Toronto (34 members)
- Townships (15 members)
- Toxics and Pollution (116 members)
- Transportation (270 members)
- Trees and Forests (61 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 (77 members)
- US (760 members)
- US Environmental Protection Agency (809 members)
- Uganda (1 member)
- Ukraine (67 members)
- United Arab Emirates (21 members)
- United Kingdom (27 members)
- United Nations (553 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 (153 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 (85 members)
- Virtual Planet (97 members)
- Virtual Reality (18 members)
- Visual Pollution (4 members)
- Voting (96 members)
- Voting Rights (102 members)
- Voting Systems (102 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 (259 members)
- Water Pollution (55 members)
- Water Quality (483 members)
- Water Saving (94 members)
- Watersheds (46 members)
- West Virginia (33 members)
- Western Asia (6 members)
- Western Australia (4 members)
- Wetlands (148 members)
- Whole Earth (1,621 members)
- Wildlife (265 members)
- William and Mary (5 members)
- Wind Energy (459 members)
- Wind Power (30 members)
- Wisconsin (49 members)
- Women's Issues (33 members)
- Women's Rights (102 members)
- Women and Gender (64 members)
- Workers Rights (80 members)
- Workplace Regulations (10 members)
- World Bank (320 members)
- World Bank Group (10 members)
- World Wide Web (683 members)
- Wyoming (8 members)
- Yemen (2 members)
- Youth (712 members)
- Yukon Territory (1 member)
- Zambia (2 members)
- Zero Waste (28 members)
- Zimbabwe (3 members)
- Zoology (33 members)