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        Clues from Past Climates

        How do scientists make judgments about past climates, when reliable instrumental records have only been available for the past few hundred years? What data do they rely on? In this interactive activity produced by ThinkTV, explore climate data sources from the natural world as well as man-made documentary evidence. Learn how scientists use data from tree rings, historical documents, coral records, pollen records, cave formations, and lake and seashores to better understand past climates.

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