ultraviolet (UV) radiation 57, 59 Union of Concerned Scientists 27 United Nations 177c United Nations Conference on Environment and Development (UNCED) 177c

United Nations Environmental Programme (UNEP) 128, 153 United Nations Framework Convention on Climate Change 162, 177c, 178c United States Global Change Research

Program 178c United States Office of Naval Research 175c

United States Weather Bureau 15 uplift weathering hypothesis 53-54, 54 upper atmosphere 109 upwelling 87-88, 114 UV. See ultraviolet radiation

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