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The frigid Antarctic region is an expanse of white ice and blue waters, as pictured in March 2017, at the U.S. research facility McMurdo Station. NASA's Operation IceBridge has collected annual measurements of Antarctic ice to track changes and help predict sea level rise. (Chris Larsen/NASA via AP) **FILE**
Photo by: Chris Larsen
The frigid Antarctic region is an expanse of white ice and blue waters, as pictured in March 2017, at the U.S. research facility McMurdo Station. NASA's Operation IceBridge has collected annual measurements of Antarctic ice to track changes and help predict sea level rise. (Chris Larsen/NASA via AP) **FILE**

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