ce cores recently recovered from high-elevation sites within the Tropics are providing long, detailed records of past climate. These histories contain information about global-scale changes in climate as well as environmental changes in areas where most human activities occur. Climatic information is reconstruct- ed from ice cores by analysis of geo- chemical measurements made sequen- tially down-core, including oxygen isotopic ratios, chemistry, and the con- centration of dust. Two ice cores were drilled to bedrock (each 435 ft) in July 1997 at the summit of an ice cap in the Andes of Bolivia, by Dr. Lonnie Thompson, The Ohio State University, and his team. Climatologists from the University of Massachusetts (UMass) are collaborating with these scientists to document the ice cap climate,

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