Massive walls might halt the collapse of thawing Antarctic ice sheets

A NASA plane captured this picture while flying over the Thwaites Ice Shelf.

It would be best for humanity if the colossal ice sheets that blanket Antarctica stayed put. But, there’s growing evidence that as the planet heats up, these sprawling glaciers could begin flowing into the ocean at an accelerated pace, boosting sea levels not in feet — but yards. To halt the melting ice, some scientists have now proposed an ambitious geoengineering plan: constructing massive undersea walls to keep Antarctica’s ice in place.  As Earth’s temperature continues to rise due to

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