What a 'sobering' report on Arctic ice loss means for global sea levels

Tuesday marked the release of yet another stark report detailing how the increased warming of our atmosphere is transforming the planet. The National Oceanic and Atmospheric Administration’s annual Arctic Report Card includes some grim news for wildlife, native communities and global sea-level rise. William Brangham talks to Dartmouth College’s Erich Osterberg about the impact of melting ice.

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