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The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Culture (54 members)
- Cyprus (2 members)
- Czech Republic (1 member)
- Davis (10 members)
- Delaware (7 members)
- Democracy (443 members)
- Democratic Republic of the Congo (2 members)
- Democratization of Space (356 members)
- Denmark (3 members)
- Denver (10 members)
- Desertification (468 members)
- Digital Citizen (798 members)
- Digital Rights (234 members)
- Disability Issues (26 members)
- District of Columbia (6 members)
- Diversity (89 members)
- Divestment from Fossil Fuels (64 members)
- Djibouti (1 member)
- Dominica (21 members)
- Dominican Republic (22 members)
- Drinking Water (23 members)
- Duke Univ (7 members)
- Duopoly (3 members)
- EOS eco Operating System (968 members)
- ESA (629 members)
- Earth (410 members)
- Earth360 (1,632 members)
- EarthPOV (584 members)
- Earth Art (150 members)
- Earth Day (194 members)
- Earth Imaging (752 members)
- Earth Law (209 members)
- Earth Observations (1,574 members)
- Earth Science (1,806 members)
- Earth Science from Space (972 members)
- Earth System Science (704 members)
- East Timor (1 member)
- Eckerd College (8 members)
- Eco-Quotes (52 members)
- Eco-Spirituality (322 members)
- Eco-Theology (82 members)
- Eco-ethics (281 members)
- Eco-nomics (1,164 members)
- Ecofeminism (84 members)
- Ecological Economics (370 members)
- Ecology Studies (1,530 members)
- Economic Development (331 members)
- Economic Justice (410 members)
- Economics (95 members)
- Ecoregions (157 members)