1.
Ukata
2.
Ukrainian Wind Energy Asociation
3.
Unified Ground
4.
United States Society on Dams
5.
Upper Peninsula Environmental Coalition
6.
UPROSE
7.
Upstream Alliance
8.
Uranium Corporation of India
9.
Urban Rivers
10.
US BCSD
11.
Utah Dine Bikeyah
12.
Utah Outdoor Association