The Atlantic meridional overturning circulation, a significant system of currents like the Gulf Stream, transports warm Atlantic water to Europe and returns cold water. If disrupted, it will lead to a significant drop in average temperatures. Projections indicate that some areas could experience temperature decreases of more than 10 degrees. The most affected regions will be Scandinavia and Iceland, with noticeable cooling extending to the British Isles, northern France, Germany, and the Baltic region.