In this photo provided by Jim Best/University of Illinois, taken in 2016, a close-up view of the ice-walled canyon at the terminus of the Kaskawulsh Glacier, with recently collapsed ice blocks. This canyon now carries almost all meltwater from the toe of the glacier down the Kaskawulsh Valley and toward the Gulf of Alaska and the Pacific Ocean instead of the Bering Sea. (Jim Best/University of Illinois via AP)
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