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The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Ecuador (2 members)
- Education (891 members)
- Egypt (6 members)
- El Salvador (1 member)
- Elder Issues (7 members)
- Election Law (101 members)
- Election System Reform (145 members)
- Electoral System Reform (104 members)
- Electric-Powered Transportation (117 members)
- Electric Vehicles (63 members)
- Endangered Species (57 members)
- Energy (911 members)
- Energy Policy (146 members)
- Energy Saving (7 members)
- England (10 members)
- Entity Type (13 members)
- Environmental Full-cost Accounting (588 members)
- Environmental Laws (834 members)
- Environmental Movement (0 members)
- Environmental Protection (1,470 members)
- Environmental Security (1,748 members)
- Environmental Security, National Security (1,246 members)
- Envirosecurity (45 members)
- Equatorial Guinea (1 member)
- Eritrea (1 member)
- Estonia (1 member)
- Estuary (54 members)
- Ethiopia (1 member)
- Eurasia (73 members)
- Europe (146 members)
- European Union (445 members)
- Evergreen State (5 members)
- Evolutionary Biology (15 members)
- Exoplanets (18 members)
- Externalities (683 members)
- Extinction (580 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 (175 members)
- Flexible Work Time (16 members)
- Florida (428 members)
- Food (562 members)
- Food-Related Policies (221 members)
- Food Packaging (23 members)
- Food Saving (5 members)
- Food in Schools (1 member)
- Foot-Powered Transportation (83 members)
- Foreclosures (8 members)
- Forest (81 members)
- Forests (573 members)
- Formula Businesses (4 members)
- Fossil Fuels (601 members)
- France (49 members)
- Ft. Collins (17 members)
- Fuel Cell Vehicles (3 members)
- GP360 NewPages (17 members)
- Gabon (1 member)
- Gambia (1 member)
- Gas-Powered Transportation (67 members)
- Genetic Engineering (36 members)
- Geneva (6 members)
- Geoencoding failed (0 members)
- Geoengineering (42 members)
- Geology (170 members)
- Geophysics (170 members)
- Geophysics and Geochemistry (175 members)
- Georgia (23 members)
- Georgia, Europe (1 member)
- Georgia Tech (5 members)
- Geothermal Energy (1 member)
- Germany (74 members)
- Ghana (1 member)
- Global Security (1,315 members)
- Global Warming (1,220 members)
- Globalization (30 members)
- Greece (1 member)
- GreenLinks (29 members)
- GreenPolicy360 (317 members)
- Green Banking (41 members)
- Green Best Practices (937 members)
- Green Business (231 members)
- Green Climate Fund (15 members)
- Green Energy Initiatives (74 members)
- Green Funds (17 members)
- Green Graphics (3,314 members)
- Green Infrastructure (35 members)
- Green Institute (13 members)
- Green Marketing (52 members)
- Green Networking (819 members)
- Green Party (103 members)
- Green Platform (80 members)
- Green Politics (1,670 members)
- Green Values (368 members)
- Greenland (405 members)
- Grenada (19 members)
- Guatemala (1 member)
- Guinea (1 member)
- Guinea-Bissau (19 members)
- Guyana (19 members)
- Haiti (20 members)
- Harvard (5 members)
- Has location (2,185 members)
- Hawaii (12 members)
- Hazardous Waste (12 members)
- Hazing (17 members)
- Health (795 members)
- Heliophysics (8 members)
- Homelessness (16 members)
- Honduras (1 member)
- Hong Kong (1 member)
- Housing (55 members)
- Houston (6 members)
- Human Population (2 members)
- Human Rights (558 members)
- Hungary (4 members)
- Hydrogen-Based Energy (7 members)
- Hydrology (177 members)
- IMF (13 members)
- INDC (663 members)
- IOT (17 members)
- ISS (275 members)
- Iceland (6 members)
- Idaho (9 members)
- Illinois (71 members)
- Imported vocabulary (8 members)
- India (72 members)
- Indiana (21 members)
- Indigenous Peoples (39 members)
- Indonesia (2 members)
- Industrialization (8 members)
- Initiative and Referendum (46 members)
- Initiatives (70 members)
- International Economic Organizations (11 members)
- Internet (252 members)
- Invasive Species (8 members)
- Iowa (25 members)
- Iran (30 members)
- Iraq (25 members)
- Ireland (15 members)
- Israel (51 members)
- Italy (16 members)
- Jamaica (19 members)
- Japan (12 members)
- Jordan (3 members)
- Kansas (25 members)
- Kansas City (28 members)
- Karma (1 member)
- Kazakhstan (2 members)
- Kentucky (15 members)
- Kenya (2 members)
- Kiribati (19 members)
- Kuwait (25 members)
- Kyrgyzstan (1 member)
- LEED (22 members)
- LGBT (24 members)
- Labor Issues (124 members)
- Labor Unions (50 members)
- Labrador (1 member)
- Land Ethic (297 members)
- Land Use (131 members)
- Laos (1 member)
- Las Vegas (4 members)
- Latvia (1 member)
- Lebanon (3 members)
- Legislation (60 members)
- Lesotho (1 member)
- Liberia (1 member)
- Libya (1 member)
- Liechtenstein (1 member)
- Light Pollution (10 members)
- Links (4 members)
- Lisbon (2 members)
- Lithuania (1 member)
- Living Wage (74 members)
- Location (207 members)
- London (3 members)
- Los Angeles (12 members)
- Louisiana (16 members)
- Luxembourg (1 member)
- Macalester College (5 members)
- Macedonia (1 member)
- Madagascar (3 members)
- Madison (11 members)
- Maine (29 members)
- Maker Movement (7 members)
- Malawi (1 member)
- Malaysia (1 member)
- Maldives (20 members)
- Mali (1 member)
- Malta (1 member)
- Manila (1 member)
- Manitoba (1 member)
- Maps (615 members)
- Marijuana (9 members)
- Marin County (10 members)
- Marshall Islands (27 members)
- Maryland (37 members)
- Mass Transit (4 members)
- Massachusetts (61 members)
- Mauritania (1 member)
- Mauritius (1 member)
- Media (312 members)
- Mediation (10 members)
- Mexico (1 member)
- Miami (5 members)
- Michigan (32 members)
- Micro-satellites (82 members)
- Micro Loans (4 members)
- Microbiology (86 members)
- Micronesia (19 members)
- Microorganism (98 members)
- Micropayments (4 members)
- Middle East (99 members)
- Millennials (31 members)
- Mineralogy (139 members)
- Minimum Wage (33 members)
- Minnesota (52 members)
- Mississippi (6 members)
- Missouri (60 members)
- Mobile (40 members)
- Mobile Internet (86 members)
- Mobile Online (32 members)
- Mobile Web (24 members)
- Model Legislation (27 members)
- Moldova (1 member)
- Monaco (1 member)
- Money in Politics (615 members)
- Mongolia (2 members)
- Montana (16 members)
- Montenegro (1 member)
- Morocco (1 member)
- Movies (29 members)
- Mozambique (1 member)
- Multilateral Development Banks (10 members)
- Multnomah County (20 members)
- Municipal Code (0 members)
- Municipal Electricity (3 members)
- Myanmar (1 member)
- Myanmar (Burma) (1 member)
- NASA (1,140 members)
- NOAA (652 members)
- NYC (23 members)
- Namibia (1 member)
- NanoRacks (50 members)
- Nashville (36 members)