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The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Afghanistan (6 members)
- Africa (75 members)
- Agricultural Economics (253 members)
- Agriculture (527 members)
- Air Pollution (457 members)
- Air Quality (548 members)
- Alabama (6 members)
- Alaska (57 members)
- Albania (2 members)
- Alberta (7 members)
- Algeria (1 member)
- Allegheny College (5 members)
- Alternative Agriculture (493 members)
- Alternative Living (65 members)
- Amazonia (12 members)
- Andorra (1 member)
- Angola (2 members)
- Animals (39 members)
- Antarctica (398 members)
- Anthropocene (1,152 members)
- Anti-Hazing (1 member)
- Anti-Sweatshop (34 members)
- Antigua and Barbuda (19 members)
- Appropriate Technology (39 members)
- Aquifers (170 members)
- Arctic (489 members)
- Argentina (3 members)
- Arizona (40 members)
- Arizona State Univ. (0 members)
- Arizona State University (5 members)
- Arkansas (10 members)
- Armenia (3 members)
- Ashland (13 members)
- Asia (55 members)
- Astrobiology (21 members)
- Asunción (1 member)
- Atmosphere (188 members)
- Atmospheric Science (1,465 members)
- Austin (16 members)
- Australia (30 members)
- Austria (4 members)
- Azerbaijan (1 member)
- Bahamas (22 members)
- Bahrain (25 members)
- Ballot Access (32 members)
- Ballot Initiatives (56 members)
- Ballot Measures (28 members)
- Bangladesh (1 member)
- Barbados (19 members)
- Belarus (2 members)
- Belgium (1 member)
- Belize (21 members)
- Bellingham (11 members)
- Benin (1 member)
- Berea College (6 members)
- Berkeley (24 members)
- Best Practices (97 members)
- Best practice system (18 members)
- Bhutan (1 member)
- Big-Box Retail (17 members)
- Biodiversity (771 members)
- Biofuel (1 member)
- Biogeosciences (261 members)
- Biomimicry (35 members)
- Bioneers (349 members)
- Bioregionalism (68 members)
- Biosphere (370 members)
- Bolivia (1 member)
- Bosnia and Herzegovina (1 member)
- Boston (1 member)
- Botswana (1 member)
- Boulder (1 member)
- Bowdoin College (5 members)
- Brazil (23 members)
- British Columbia (46 members)
- Browse (5 members)
- Brunei (1 member)
- Building Standards (142 members)
- Bulgaria (1 member)
- Burkina Faso (1 member)
- Burundi (1 member)
- Business Regulations (16 members)
- Buy Green Policy (69 members)
- Bylaws (11 members)
- Cabo Verde (19 members)
- California (693 members)
- California, Plastic Bag Ban (3 members)
- Cambodia (1 member)
- Cameroon (1 member)
- Campaign Finance (82 members)
- Canada (160 members)
- Capital Punishment (7 members)
- Carbon Sequestration (45 members)
- Caribbean (33 members)
- Carnegie Mellon (7 members)
- Central African Republic (1 member)
- Central America (6 members)
- Chad (1 member)
- Charter Amendments (11 members)
- Charters (4 members)
- Chicago (13 members)
- Chile (3 members)
- China (120 members)
- Citizen Academies (17 members)
- Citizen Review (12 members)
- Citizen Science (880 members)
- City-County Governments (292 members)
- City Governments (1,568 members)
- Civil Liberties (44 members)
- Civil Rights (272 members)
- Clean Air (320 members)
- Clean Water (311 members)
- Cleaning Products (12 members)
- Clearwater (2 members)
- Climate Change (2,173 members)
- Climate Migration (391 members)
- Climate Policy (1,829 members)
- Climate Smart Agriculture (27 members)
- Code (100 members)
- Cohousing (3 members)
- Colby College (5 members)
- Colleges (481 members)
- Colombia (1 member)
- Colorado (91 members)
- Colorado State (5 members)
- Communications (19 members)
- Community Gardens (31 members)
- Comoros (19 members)
- Composting (18 members)
- Conflict Resolution (5 members)
- Congo (1 member)
- Connecticut (19 members)
- Connecticut College (5 members)
- Cook Islands (19 members)
- Cooperatives (4 members)
- Cornell Univ (8 members)
- Corporate Accountability (46 members)
- Costa Rica (12 members)
- Cote d'Ivoire/Ivory Coast (1 member)
- Councils (51 members)
- Countries (397 members)
- Country (216 members)
- County Governments (631 members)
- Creation Spirituality (50 members)
- Croatia (1 member)
- Cryosphere (224 members)
- Cuba (20 members)
- Culture (53 members)
- Cyprus (2 members)
- Czech Republic (1 member)
- Davis (10 members)
- Delaware (7 members)
- Democracy (416 members)
- Democratic Republic of the Congo (2 members)
- Democratization of Space (349 members)
- Denmark (3 members)
- Denver (10 members)
- Desertification (455 members)
- Digital Citizen (779 members)
- Digital Rights (225 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 (962 members)
- ESA (605 members)
- Earth (387 members)
- Earth360 (1,593 members)
- EarthPOV (575 members)
- Earth Art (146 members)
- Earth Day (183 members)
- Earth Imaging (719 members)
- Earth Law (202 members)
- Earth Observations (1,539 members)
- Earth Science (1,769 members)
- Earth Science from Space (948 members)
- Earth System Science (673 members)
- East Timor (1 member)
- Eckerd College (8 members)
- Eco-Quotes (52 members)
- Eco-Spirituality (317 members)
- Eco-Theology (82 members)
- Eco-ethics (250 members)
- Eco-nomics (1,133 members)
- Ecofeminism (82 members)
- Ecological Economics (370 members)
- Ecology Studies (1,492 members)
- Economic Development (330 members)
- Economic Justice (394 members)
- Economics (95 members)
- Ecoregions (153 members)
- Ecotourism (36 members)
- Ecuador (2 members)
- Education (898 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 (917 members)
- Energy Policy (146 members)
- Energy Saving (7 members)
- England (10 members)
- Entity Type (13 members)
- Environmental Full-cost Accounting (593 members)
- Environmental Laws (842 members)
- Environmental Movement (0 members)
- Environmental Protection (1,476 members)
- Environmental Security (1,754 members)
- Environmental Security, National Security (1,252 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 (688 members)
- Extinction (584 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 (432 members)
- Food (566 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 (606 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 (1,320 members)
- Global Warming (1,226 members)
- Globalization (30 members)
- Greece (1 member)
- GreenLinks (30 members)
- GreenPolicy360 (319 members)
- Green Banking (41 members)
- Green Best Practices (940 members)
- Green Business (232 members)
- Green Climate Fund (15 members)
- Green Energy Initiatives (74 members)
- Green Funds (17 members)
- Green Graphics (3,318 members)
- Green Infrastructure (35 members)
- Green Institute (13 members)
- Green Marketing (52 members)
- Green Networking (825 members)
- Green Party (103 members)
- Green Platform (80 members)
- Green Politics (1,676 members)
- Green Values (369 members)
- Greenland (409 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 (799 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 (664 members)
- IOT (17 members)
- ISS (276 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 (255 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 (208 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 (620 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 (313 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 (620 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 (1,146 members)
- NOAA (658 members)
- NYC (23 members)
- Namibia (1 member)
- NanoRacks (50 members)
- Nashville (36 members)
- National Security (160 members)
- Natural Capital (137 members)
- Natural Resource Economics (19 members)
- Natural Resources (1,093 members)
- Natural Rights (143 members)
- Nature (285 members)
- Nauru (19 members)
- Nebraska (3 members)
- Nepal (6 members)
- Netherlands (4 members)
- Netizen (48 members)
- Networking (938 members)
- Nevada (20 members)
- New Brunswick (0 members)
- New Definitions of National Security (1,068 members)
- New Economy (412 members)
- New Hampshire (15 members)
- New Jersey (28 members)
- New Mexico (85 members)
- New South Wales (15 members)
- New Space (899 members)
- New Transcendentalists (6 members)
- New York (126 members)
- New Zealand (62 members)
- Newfoundland (1 member)
- Nicaragua (1 member)
- Niger (1 member)
- Nigeria (1 member)
- Niue (19 members)
- Noise Pollution (6 members)
- North America (40 members)
- North Carolina (68 members)
- North Dakota (7 members)
- North Korea (40 members)
- Northern Ireland (3 members)
- Northern Territory (2 members)
- Northwest Territories (1 member)
- Norway (7 members)
- Notable Colleges (25 members)
- Nova Scotia (1 member)
- Nuclear Free (145 members)
- Nuclear Nonproliferation (268 members)
- Nuclear Proliferation (210 members)
- Nuclear Weapons (293 members)
- Nunavut (1 member)
- Oakland (30 members)
- Ocean Ecosystem (225 members)
- Ocean Science (916 members)
- Ocean Sustainability (156 members)
- Oceania (41 members)
- Oceans (756 members)
- Off the Grid (91 members)