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uncertainties 40-41 UNFCCC (United Nations Framework Convention on Climate Change) 171c

United Nations 171c United Nations Conference on

Environment and Development 171c United Nations Framework Convention on Climate Change (UNFCCC) 171c

United States Global Change Research

Program 172c University of Arizona Laboratory of Tree

Ring Research (LTRR) 107 unsaturated zone 93 U.S. Geological Survey (USGS) alluvial fan studies 66, 68 computer modeling 113 geological oceanography 84 Great Plains sand dune studies 68-69 lake sediment study 79, 81 on long-term climate change 18 macrofossil studies 112 pack rat midden research 100 proxy data use by 59 and radiometric dating 53 USGS. See U.S. Geological Survey U.S. National Academy of Sciences 171c

U.S. Office of Naval Research 169c uranium-lead dating 48-49 uranium-thorium dating. See thorium-230

dating Utah 112

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