The weak underbelly of a giant Antarctic ice sheet just lost a berg more than four times the size of Manhattan

We’ve now got yet another worrying sign that human-caused warming is causing the behemoth West Antarctic Ice Sheet to come unglued, threatening to raise sea level by 10 feet over time.

You can see that sign in the image above from the Sentinel-1 satellite.

The image shows a 103-square-mile tabular iceberg — equal in size to four and a half Manhattan islands — breaking off from the floating edge of the Pine Island Glacier in West Antarctica on September 23rd. It was posted to Twitter by

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