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The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Programs (412 members)
- Provinces (15 members)
- Puerto Rico (1 member)
- Qatar (24 members)
- Quebec (10 members)
- Queensland (12 members)
- Radioactive Pollution (84 members)
- Radioactive Waste (68 members)
- Rain Forest (13 members)
- Rainforest (369 members)
- Recycling (160 members)
- Redistricting (32 members)
- Referendums (5 members)
- Renewable Energy (1,102 members)
- Republic of the Congo (2 members)
- Resilience (1,126 members)
- Resolution (0 members)
- Resolutions (673 members)
- Rhode Island (11 members)
- Rice University (8 members)
- Rights of Nature (141 members)
- Risk Management (4 members)
- Rivers (35 members)
- Romania (1 member)
- Rome (2 members)
- Roscosmos (1 member)
- Russian Federation (175 members)
- Rwanda (1 member)
- Saint Kitts and Nevis (19 members)
- Saint Lucia (19 members)
- Saint Vincent and the Grenadines (19 members)
- Samoa (20 members)
- San Francisco (63 members)
- San Marino (1 member)
- Santa Cruz (14 members)
- Santa Fe (18 members)
- Santa Monica (4 members)
- Sao Tome and Principe (19 members)
- Saskatchewan (1 member)
- Saudi Arabia (26 members)
- Savannah (1 member)
- School Districts (57 members)
- Scotland (11 members)
- Sea-Level Rise & Mitigation (831 members)
- Sea-level Rise (616 members)
- Seattle (40 members)
- Seattle Univ (6 members)
- Senegal (1 member)
- Serbia (1 member)
- Seventh Generation Sustainability (404 members)
- 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)