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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 (423 members)
- Democratic Republic of the Congo (2 members)
- Democratization of Space (353 members)
- Denmark (3 members)
- Denver (10 members)
- Desertification (459 members)
- Digital Citizen (784 members)
- Digital Rights (229 members)
- Disability Issues (26 members)
- District of Columbia (6 members)
- Diversity (88 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 (964 members)
- ESA (614 members)
- Earth (394 members)
- Earth360 (1,605 members)
- EarthPOV (576 members)
- Earth Art (148 members)
- Earth Day (189 members)
- Earth Imaging (731 members)
- Earth Law (207 members)
- Earth Observations (1,551 members)
- Earth Science (1,782 members)
- Earth Science from Space (955 members)
- Earth System Science (687 members)
- East Timor (1 member)
- Eckerd College (8 members)
- Eco-Quotes (52 members)
- Eco-Spirituality (319 members)
- Eco-Theology (82 members)
- Eco-ethics (259 members)
- Eco-nomics (1,144 members)
- Ecofeminism (82 members)
- Ecological Economics (370 members)
- Ecology Studies (1,503 members)
- Economic Development (330 members)
- Economic Justice (399 members)
- Economics (95 members)
- Ecoregions (155 members)
- Ecotourism (36 members)