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The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- 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 (1,221 members)
- Globalization (30 members)
- Greece (1 member)
- GreenLinks (29 members)
- GreenPolicy360 (318 members)
- Green Banking (41 members)
- Green Best Practices (938 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 (1,671 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 (664 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)