Categories
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The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- WTO (4 members)
- WWU (5 members)
- Wales (3 members)
- Warfare and the Environment (6 members)
- Warsaw (1 member)
- Washington (182 members)
- Washington DC (6 members)
- Waste Management (5 members)
- Wastewater Treatment (13 members)
- Water (260 members)
- Water Pollution (55 members)
- Water Quality (485 members)
- Water Saving (94 members)
- Watersheds (46 members)
- West Virginia (33 members)
- Western Asia (6 members)
- Western Australia (4 members)
- Wetlands (148 members)
- Whole Earth (1,624 members)
- Wildlife (265 members)