A Huge Iceberg Just Broke Off West Antarctica’s Most Endangered Glacier

A huge iceberg just broke off West Antarctica’s most endangered glacier

Huge blocks of ice regularly shear away from Antarctica’s ice shelves, but the losses are speeding up.

On the ice-covered edge of a remote West Antarctic bay, the continent’s most imperiled glaciers threaten to redraw Earth’s coastlines. Pine Island Glacier and its neighbor Thwaites Glacier are the gateway to a massive cache of frozen water, one that would raise global sea levels by four feet if it were all to spill into the sea. And that gateway is shattering before our eyes.

Over the weekend, the European Space Agency’s Sentinel satellites spotted a significant breakup, or calving event, underway on Pine Island Glacier’s floating ice shelf. A series of rifts that satellites have been monitoring since early 2019 grew rapidly last week. By Sunday, a 120 square-mile chunk of ice—a little under three San Franciscos in size—had broken off the glacier’s front. It quickly shattered into a constellation of smaller icebergs, the largest of which was big enough to earn itself a name: B-49. (Find out why it's our fault that West Antarctica is melting.)

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