Billions of tonnes of meltwater flowing into the world’s oceans from the Greenland and Antarctic ice sheets could boost extreme weather and destabilise regional climate in a matter of decades, researchers said.

The melting ice giants, especially the one atop Greenland, are poised to further weaken the ocean currents that move cold water south along the Atlantic Ocean’s floor, while pushing tropical waters northward closer to the surface, scientists reported in the journal, Nature.

Known as the Atlantic Meridional Overturning…