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The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- About Us (281 members)
- Additional Website Resources - Linked Data - Green Best Practices (160 members)
- Affordable Housing (66 members)
- Afghanistan (6 members)
- Africa (85 members)
- Agricultural Economics (254 members)
- Agriculture (556 members)
- Air Pollution (488 members)
- Air Quality (578 members)
- Alabama (6 members)
- Alaska (68 members)
- Albania (2 members)
- Alberta (7 members)
- Algeria (1 member)
- Allegheny College (5 members)
- Alternative Agriculture (524 members)
- Alternative Living (66 members)
- Amazonia (12 members)
- Andorra (1 member)
- Angola (2 members)
- Animals (39 members)
- Antarctica (423 members)
- Anthropocene (1,214 members)
- Anti-Hazing (1 member)
- Anti-Sweatshop (34 members)
- Antigua and Barbuda (21 members)
- Appropriate Technology (40 members)
- Aquifers (176 members)
- Arctic (519 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 (66 members)
- Astrobiology (21 members)
- Asunción (1 member)
- Atmosphere (192 members)
- Atmospheric Science (1,516 members)
- Austin (16 members)
- Australia (41 members)
- Austria (4 members)
- Azerbaijan (1 member)
- Bahamas (24 members)
- Bahrain (33 members)
- Ballot Access (32 members)
- Ballot Initiatives (58 members)
- Ballot Measures (28 members)