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The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Chad (1 member)
- Charter Amendments (11 members)
- Charters (4 members)
- Chicago (13 members)
- Chile (3 members)
- China (118 members)
- Citizen Academies (17 members)
- Citizen Review (11 members)
- Citizen Science (867 members)
- City-County Governments (286 members)
- City Governments (1,557 members)
- Civil Liberties (42 members)
- Civil Rights (267 members)
- Clean Air (313 members)
- Clean Water (304 members)
- Cleaning Products (12 members)
- Clearwater (2 members)
- Climate Change (2,152 members)
- Climate Migration (386 members)
- Climate Policy (1,806 members)
- Climate Smart Agriculture (27 members)
- Code (100 members)
- Cohousing (3 members)
- Colby College (5 members)
- Colleges (480 members)
- Colombia (1 member)
- Colorado (91 members)
- Colorado State (5 members)
- Communications (19 members)
- Community Gardens (31 members)
- Comoros (19 members)
- Composting (18 members)
- Conflict Resolution (5 members)
- Congo (1 member)
- Connecticut (19 members)
- Connecticut College (5 members)
- Cook Islands (19 members)
- Cooperatives (4 members)
- Cornell Univ (8 members)
- Corporate Accountability (45 members)
- Costa Rica (12 members)
- Cote d'Ivoire/Ivory Coast (1 member)
- Councils (51 members)
- Countries (393 members)
- Country (219 members)
- County Governments (620 members)
- Creation Spirituality (50 members)
- Croatia (1 member)
- Cryosphere (223 members)
- Cuba (20 members)
- Culture (53 members)
- Cyprus (2 members)
- Czech Republic (1 member)
- Davis (10 members)
- Delaware (7 members)
- Democracy (405 members)
- Democratic Republic of the Congo (2 members)
- Democratization of Space (347 members)
- Denmark (3 members)
- Denver (10 members)
- Desertification (450 members)
- Digital Citizen (766 members)
- Digital Rights (221 members)
- Disability Issues (26 members)
- District of Columbia (6 members)
- Diversity (87 members)
- Divestment from Fossil Fuels (61 members)
- Djibouti (1 member)
- Dominica (19 members)
- Dominican Republic (20 members)
- Drinking Water (23 members)
- Duke Univ (7 members)
- Duopoly (3 members)
- EOS eco Operating System (957 members)
- ESA (592 members)
- Earth (380 members)
- Earth360 (1,577 members)
- EarthPOV (571 members)
- Earth Art (146 members)
- Earth Day (182 members)
- Earth Imaging (702 members)
- Earth Law (199 members)
- Earth Observations (1,523 members)
- Earth Science (1,751 members)
- Earth Science from Space (933 members)
- Earth System Science (657 members)
- East Timor (1 member)
- Eckerd College (8 members)
- Eco-Quotes (52 members)
- Eco-Spirituality (316 members)
- Eco-Theology (82 members)
- Eco-ethics (233 members)
- Eco-nomics (1,117 members)
- Ecofeminism (81 members)
- Ecological Economics (370 members)
- Ecology Studies (1,471 members)
- Economic Development (330 members)
- Economic Justice (384 members)
- Economics (95 members)
- Ecoregions (152 members)