Why is an ocean current critical to world weather losing steam? Scientists search the Arctic for answers.

A conveyor belt of ocean water that loops the planet and regulates global temperatures could be heading for a tipping point.

Sea ice over the Greenland Sea near northeast Greenland. Arctic sea ice this summer was the second lowest on record, and ocean changes in the Arctic could dramatically change the climate for much of the rest of the planet.
Photograph by Lawrence Hislop

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