AI Summary

Barnes Ice Cap on Baffin Island is the last fragment of the Laurentide Ice Sheet, which once covered most of Canada under two miles of ice and lowered sea level by about 80 m. A recent Science study examined the cap’s physical record and found that the Laurentide reached its smallest extent around 3,600 years ago. The data then show the ice sheet began re‑expanding roughly 2,000 years ago, a pattern the authors interpret as the start of a new glaciation. That growth continued until about 1960, when anthropogenic warming halted the expansion.

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