Photo: Scientist Chases Fast-Melting Tropical Glaciers

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Lonnie Thompson stands in the "cold room," where ice cores are stored in the minus-30-degree Fahrenheit (minus-34-degree Celsius) freezer at Byrd Polar Research Center at Ohio State University in Columbus, Ohio.

Thompson is chasing fast-melting, tropical ice.

Photograph by Kiichiro Sato /AP

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