It's called the Gulf Stream. One of the doomsday climate scenarios is that melting continental ice shuts down the Gulf Stream, resulting in western Europe having the same climatology as the similar latitudes in Canada. This occurred regularly at the end of big ice ages when the North American continental ice released into the Atlantic via the St. Lawrence River. Skeptics point out that the volume of the North American continental ice was vastly greater than what's in Greenland.Europe and North America latitudes.
Current climatology on that overlay only matches up with SoCal and coastal Morocco.
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