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SOURCE: Scientific American

DATE: July 31, 2017

SNIP: The world saw headlines about one of the largest icebergs ever calved a few weeks ago. But a smaller one on the other end of the globe might have bigger consequences.

The chunk of ice, which broke free in the Arctic last week, is more worrisome to climate scientists who are watching one of Earth’s largest glaciers shed pieces in a way that stands to raise sea levels.

Movement of the Petermann Glacier has sped up in recent years, dumping land-based ice into the ocean at a faster rate and drawing more ice down from the center of Greenland, said Laurence Dyke, a researcher at the Geological Survey of Denmark and Greenland. Meanwhile, the ice shelf that braces it and slows the rate of flow is disintegrating as climate change transforms the region.

“You could call it the canary in the coal mine. If that big glacier there is changing quickly, and it is, it’s a worrying sign for what’s happening in the rest of Greenland,” he said.