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The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Earth Science from Space (976 members)
- Earth System Science (708 members)
- Earth Systems Science (1 member)
- East Timor (1 member)
- Eckerd College (8 members)
- Eco-Quotes (52 members)
- Eco-Spirituality (323 members)
- Eco-Theology (82 members)
- Eco-ethics (287 members)
- Eco-nomics (1,168 members)
- Ecofeminism (84 members)
- Ecological Economics (371 members)
- Ecology Studies (1,537 members)
- Economic Development (331 members)
- Economic Justice (412 members)
- Economics (95 members)
- Ecoregions (157 members)
- Ecotourism (36 members)
- Ecuador (2 members)
- Education (946 members)
- Egypt (6 members)
- El Salvador (1 member)
- Elder Issues (7 members)
- Election Law (106 members)
- Election System Reform (151 members)
- Electoral System Reform (107 members)
- Electric-Powered Transportation (117 members)
- Electric Vehicles (63 members)
- Endangered Species (59 members)
- Energy (951 members)
- Energy Policy (158 members)
- Energy Saving (7 members)
- England (10 members)
- Entity Type (13 members)
- Environmental Full-cost Accounting (622 members)
- Environmental Laws (881 members)
- Environmental Movement (3 members)
- Environmental Protection (1,522 members)
- Environmental Security (1,798 members)
- Environmental Security, National Security (1,287 members)
- Envirosecurity (46 members)
- Equatorial Guinea (1 member)
- Eritrea (1 member)
- Estonia (1 member)
- Estuary (59 members)
- Ethiopia (1 member)
- Eurasia (77 members)
- Europe (152 members)
- European Union (466 members)
- Evergreen State (5 members)