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Ice shelf holding back Antarctica's Pine Island Glacier is breaking up

The Pine Island Glacier on the West Antarctic Ice Sheet is responsible for more than a quarter of Antarctica's contribution to global sea level rise over the past decades. Now, a new study shows it is more vulnerable to rapid melting than thought, because climate change is weakening its natural braking system.

Why it matters: At stake is the future of a glacier containing about 160 trillion tons of ice, which if it were all to melt into the ocean would cause about 1.6 feet of global sea level rise.

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