Ocean Current That Regulates Our Climate Has Been Weakening for Two Decades

Sitting on the ocean floor, anchored to the continental slope of North America, a cluster of instruments has been recording something that nobody particularly wanted to see. Pressure sensors and current meters, deployed at depths where no light reaches, have logged the slow behavior of water moving in the dark for two decades. The data they’ve accumulated now points, with unusual consistency, to a change in one of the most consequential circulatory systems on Earth. New research from the...