And probably happens every interglacial cycle because they were 2C warmer than today with less atmospheric CO2.Western Europe is currently warmer than it should be for it's latitude. The reason they are as warm as they are is because the Gulf Stream in the North Atlantic is pumping heat from the tropics into the higher latitudes.
If you warm the planet enough and melt the Greenland Ice sheet it will dump cold, fresh water into the upper reaches of the Gulf Stream. The Gulf Stream is part of a larger THERMOHALINE CIRCULATION. That means it relies on temperature and salinity to control density and flow of the current.
If the Gulf Stream shuts down (which geologic history shows it has done in the past) because it's flow has been disrupted by a bunch of cold fresh water it will cause western Europe to get cooler and possibly drier.