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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)
- Ecuador (2 members)
- Education (876 members)
- Egypt (6 members)
- El Salvador (1 member)
- Elder Issues (7 members)
- Election Law (101 members)
- Election System Reform (143 members)
- Electoral System Reform (103 members)
- Electric-Powered Transportation (117 members)
- Electric Vehicles (63 members)
- Endangered Species (56 members)
- Energy (901 members)
- Energy Policy (146 members)
- Energy Saving (7 members)
- England (10 members)
- Entity Type (13 members)
- Environmental Full-cost Accounting (580 members)
- Environmental Laws (821 members)
- Environmental Movement (0 members)
- Environmental Protection (1,458 members)
- Environmental Security (1,734 members)
- Environmental Security, National Security (1,237 members)
- Envirosecurity (45 members)
- Equatorial Guinea (1 member)
- Eritrea (1 member)
- Estonia (1 member)
- Estuary (49 members)
- Ethiopia (1 member)
- Eurasia (72 members)
- Europe (145 members)
- European Union (437 members)
- Evergreen State (5 members)
- Evolutionary Biology (15 members)
- Exoplanets (18 members)
- Externalities (675 members)
- Extinction (575 members)
- Fair-Trade Policies (1 member)
- Fair Housing (12 members)
- Fair Trade (17 members)
- Family Friendly Workplace (15 members)
- Farm-Related Policies (167 members)
- Fiji (19 members)
- Finland (4 members)
- Fisheries (168 members)
- Flexible Work Time (16 members)
- Florida (423 members)
- Food (555 members)
- Food-Related Policies (220 members)
- Food Packaging (23 members)
- Food Saving (5 members)