The huge ocean current known as the Atlantic Meridional Overturning Circulation (AMOC - not the Gulf Stream!) shifts vast amount of water around the world. But scientists fear that by heating the planet and melting the Greenland ice-sheet, we’re already slowing it down, with the risk that it could collapse - a potential tipping point with huge consequences around the world. And a new study (published in 2023) has tried to pin down what could happen, when. So what do we actually known about this current, does it have anything to do with the Gulf Stream, and is there anything we can do to protect ourselves?