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April 9, 2021 05:27 pm

A Third of Antarctic Ice Shelf Risks Collapse as Our Planet Warms

More than a third of the Antarctic ice shelf risks collapsing into the sea if global temperatures reach 4 degrees Celsius (7.2 degrees Fahrenheit) above pre-industrial levels as climate change warms the world, a new study from the UK's University of Reading has warned. From a report: In a forecasting study, scientists found that 34% of the area of all Antarctic ice shelves, measuring some half a million square kilometers, could destabilize if world temperatures were to rise by 4 degrees. Some 67% of the ice shelf area on the Antarctic Peninsula would be at risk of destabilization under this scenario, researchers said.Ice shelves are permanent floating platforms of ice attached to areas of the coastline, formed where glaciers flowing off the land meet the sea. They can help limit the rise in global sea levels by acting like a dam, slowing the flow of melting ice and water into the oceans. Each summer, ice at the surface of ice shelves melts and runs into smaller gaps in the snow below, where it usually refreezes. But when there is a lot of melting and little snowfall, this water instead pools onto the ice's surface or flows into crevasses. This deepens and widens the crevasses, causing the shelf to fracture and collapse into the sea.

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