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In a trench in Nevada, where Lawrence Livermore National Laboratory has been conducting transport studies of various isotopic and conservative tracers, researchers hope to reveal the rich record of regional climate change history that may be preserved in the chemical composition of deep vadose zone systems. William E. Glassley, John J. Nitao, and Charles W. Grant describe the background, progress, and challenges of this research in their review, "The Impact of Climate Change on the Chemical Composition of Deep Vadose Zone Waters", p. 3-13.