Take any archeological journal which publishes papers on the viking settlements digs in Greenland. Read. Rinse. Repeat.
During the late middle ages (800-1200) the names in the North Atlantic matched the scenery - Greenland was green (on the coast), Iceland was ice. That is proven many times by a science which is considerably more exact than climate modeling - archeology.
If we add the historical data from the same period - multiple recorded incidents of freezing of Black Sea, Bosphorus, Mare Marmaris, North Adriatic, Bay of Venice and Bay of Marceiles (sometimes in consecutive years) you get a pretty convincing picture of a weakened Gulfstream.
That is exactly where we are heading by the way. That is also scientifically proven, no modeling required - last 20 years of temperature, salinity and flow measurements by all European research institutions involved show that.
So, if you live in Europe - screw the greens, electric cars and their bretheren - buy an diesel 4x4 _WITH_ an engine preheater (or install an aftermarket one). Before any green opens his peephole - go and ask Nissan, Renault, etc exactly how much does the battery on the Leaf or its Renault bretheren last at -25C (answer - 20 miles on a very good day with the heating in the cockpit _OFF_).
If you live in USA - buy an air conditioner and if your property is somewhere low - change for somewhere higher.