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Before and after images of heat-stress related coral bleaching in American Samoa, in the tropical Pacific. The left image was taken in December 2014. The right image was taken in February 2015. Coral reefs, which provide food, livelihoods, and storm surge protection for many island communities, are among the natural resources that are very likely to experience severe impacts from less than 2°C of warming. Credit: XL Catlin Seaview Survey.