Climate change has caused the massive Kaskawulsh Glacier, one of Canada’s largest glaciers, to retreat so much that its meltwater abruptly switched direction, in the first documented case of "river piracy" in modern times.

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Climate change has caused the massive Kaskawulsh Glacier, one of Canada’s largest glaciers, to retreat so much that its meltwater abruptly switched direction, in the first documented case of "river piracy" in modern times.