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World risks runaway Antarctic ice melt if Paris targets not met

The world runs a growing risk of triggering accelerating and potentially unstoppable sea level rise from the Antarctic ice sheet if greenhouse gas emissions are not strictly curtailed. However, this fate can be avoided if the Paris Agreement's targets are met, according to two new studies published Wednesday.

Why it matters: At stake is the viability of coastal megacities like Shanghai, Manila and New York City, as well as entire nations like the low-lying Maldives. The severity of sea level rise depends largely on the pace and extent of ice melt from the world'stwo largest ice sheets: Antarctica and Greenland.

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