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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 (415 members)
- Democratic Republic of the Congo (2 members)
- Democratization of Space (348 members)
- Denmark (3 members)
- Denver (10 members)
- Desertification (455 members)
- Digital Citizen (775 members)
- Digital Rights (223 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 (961 members)
- ESA (603 members)
- Earth (387 members)
- Earth360 (1,587 members)
- EarthPOV (574 members)
- Earth Art (146 members)
- Earth Day (183 members)
- Earth Imaging (713 members)
- Earth Law (202 members)
- Earth Observations (1,533 members)
- Earth Science (1,763 members)
- Earth Science from Space (943 members)
- Earth System Science (668 members)
- East Timor (1 member)
- Eckerd College (8 members)
- Eco-Quotes (52 members)
- Eco-Spirituality (317 members)
- Eco-Theology (82 members)
- Eco-ethics (244 members)
- Eco-nomics (1,127 members)
- Ecofeminism (82 members)
- Ecological Economics (370 members)
- Ecology Studies (1,485 members)
- Economic Development (330 members)
- Economic Justice (390 members)
- Economics (95 members)
- Ecoregions (153 members)
- Ecotourism (36 members)