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Scientists are racing to collect ice cores — along with the long-frozen records they hold of climate cycles — as global warming melts glaciers and ice sheets. Some say they are running out of time. And, in some cases, it’s already too late.

Late last year, German-born chemist Margit Schwikowski and a team of international scientists attempted to gather ice cores from the Grand Combin glacier, high on the Swiss-Italian border, for a United Nations-backed climate monitoring effort.

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