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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 (6 members)
- ThinBlueLayer (670 members)
- Think Tank (1 member)
- Threat Multiplier (556 members)
- Tidal Power (2 members)
- Togo (1 member)
- Tompkins County (10 members)
- Tonga (1 member)
- Topic (124 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 (768 members)
- US Environmental Protection Agency (816 members)
- Uganda (1 member)
- Ukraine (73 members)
- United Arab Emirates (26 members)
- United Kingdom (27 members)
- United Nations (561 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 (86 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 (266 members)
- Water Pollution (56 members)
- Water Quality (491 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 (1,633 members)
- Wildlife (271 members)
- William and Mary (5 members)
- Wind Energy (464 members)
- Wind Power (30 members)
- Wisconsin (49 members)
- Women's Issues (33 members)
- Women's Rights (105 members)
- Women and Gender (64 members)
- Workers Rights (82 members)
- Workplace Regulations (10 members)
- World Bank (325 members)
- World Bank Group (10 members)
- World Wide Web (695 members)
- Wyoming (8 members)
- Yemen (2 members)
- Youth (724 members)
- Yukon Territory (1 member)
- Zambia (2 members)
- Zero Waste (28 members)
- Zimbabwe (3 members)
- Zoology (33 members)