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The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Green Politics (1,682 members)
- Green Values (370 members)
- Greenland (412 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 (804 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 (559 members)
- Hungary (4 members)
- Hydrogen-Based Energy (7 members)
- Hydrology (178 members)
- IMF (13 members)
- INDC (666 members)
- IOT (17 members)
- ISS (281 members)
- Iceland (6 members)
- Idaho (9 members)
- Illinois (71 members)
- Imported vocabulary (8 members)
- India (75 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 (258 members)
- Invasive Species (8 members)
- Iowa (25 members)
- Iran (30 members)
- Iraq (25 members)
- Ireland (15 members)
- Israel (51 members)
- Italy (16 members)