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The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- About Us (251 members)
- Additional Website Resources - Linked Data - Green Best Practices (154 members)
- Affordable Housing (66 members)
- Afghanistan (6 members)
- Africa (79 members)
- Agricultural Economics (253 members)
- Agriculture (533 members)
- Air Pollution (461 members)
- Air Quality (552 members)