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The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Seychelles (19 members)
- Sharing Economy (17 members)
- Sierra Leone (2 members)
- Simple Living (36 members)
- Singapore (21 members)
- Slovakia (1 member)
- Slovenia (1 member)
- Small Island Developing States (20 members)
- Smart Growth (31 members)
- Smart Homes (18 members)
- Smoking (50 members)
- Social Justice (458 members)
- Soil (451 members)
- Soil Pollution (12 members)
- Solar Energy (844 members)
- Solomon Islands (19 members)
- Somalia (2 members)
- South Africa (7 members)
- South America (18 members)
- South Australia (2 members)
- South Carolina (25 members)
- South Dakota (5 members)
- South Korea (3 members)
- South Sudan (1 member)
- Space Pollution (1 member)
- Space Science and Space Physics (333 members)
- Spain (7 members)
- Special Districts (13 members)
- Sri Lanka (1 member)
- St. Lawrence Univ (5 members)
- Stanford (8 members)
- Stardust (70 members)
- State (112 members)
- State of Palestine (6 members)
- Stormwater (10 members)
- Strategic Demands (1,427 members)
- Streams (6 members)
- Sudan (2 members)
- Suriname (1 member)
- Sustainability (988 members)
- Sustainability Policies (1,632 members)
- Swaziland (1 member)
- Sweden (6 members)
- Switzerland (3 members)
- Syria (3 members)
- TEEB (10 members)
- Taiwan (2 members)
- Tajikistan (1 member)
- Takoma Park (14 members)
- Tanzania (1 member)
- 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)