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The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- 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 (934 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)
- Ecotourism (36 members)