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sea-ice

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Researchers say the Arctic sheet is not only shrinking in area, but also losing much of its volume by thinning.

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Dr. Tom Wagner of NASA is remarkably cheerful as he explains how the historic melting of sea ice in the Arctic threatens to exacerbate climate change across the globe.

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Although this wasn't the worst winter on record for retention of Arctic sea ice, a report from NASA and the National Snow and Ice Data Center says that the region is now missing a Texas-sized chunk of the stuff that keeps polar bears alive and cities above sea level. More alarming, the ice that is there is younger, thinner and more fragile than in years past.

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