Philip Marsh

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Some lakes in the Arctic are expanding and others are disappearing as permafrost thaws. This lake north of Inuvik, N.W.T., is expanding as the ice wedges (darker lines leading away from the lake) around this lake melt and the ground subsides. (Philip Marsh)

Collapsing permafrost is transforming Arctic lakes, ponds and streams

Philip Marsh, Wilfrid Laurier University; Evan Wilcox, Wilfrid Laurier University, and Niels Weiss, Wilfrid Laurier University

Hundreds of thousands of lakes, rivers and streams in the Arctic exist only because of the permafrost that lies beneath them. The warming Arctic threatens to change that.

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