- Udall, S. L.
- 11-8
- Uluru (Ayers Rock)
- 2-169
- union bans
- 2-59 2-72 2-81 2-101 2-102 2-105 2-115 2-120 2-127 2-131 2-136 2-139 2-191 2-210 2-219
- United Tasmania Group
- 2-100
- Uniting Nations for Biosurvival
- 8-4 8-27 8-32 8-39
- University of Adelaide
- 8-26
- University of British Columbia
- 8-31
- University of Colorado
- 2-149
- University of Hawaii
- 11-16
- University of New England
- 2-89
- University of Western Australia
- 2-81
- Upper Souris National Wildlife Reserve, Canada
- 17-8
- Upper Swan Valley Alumina Refinery
- 12-20
- Upper Yarra Valley
- 11-35
- uranium
- 2-92 2-93 2-94 2-99 2-125 2-126 2-127 2-128 2-129 2-131 2-132 2-134 2-136 2-139 2-142 2-143 2-145 2-147 2-148 2-149 2-151 2-152 2-154 2-172 2-183 2-186 2-188 2-194 2-196 2-203 12-24 12-27 12-37
- uranium mining
- 2-93 2-128 2-134 2-136 2-139 2-145 2-147 2-148 2-149 2-194 2-196 12-27 12-37
- urban conservation
- 2-196
- urban planning
- 2-53 2-102 2-104 2-107 2-134 2-142
- urban sprawl
- 2-43 2-45 2-88 2-114 2-202 2-209 2-217
- Uren, T.
- 2-107 2-149
- US bans
- 2-71 2-83 2-127 2-169
- US Council on Environmental Quality
- 2-82
- US National Bison Range
- 17-42
- Utah, USA
- 17-51
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