This article in the New Scientist seems to argue that the North Atlantic Conveyer Belt is *not* the primary driver of northwestern European climatic mildness, but is rather dwarfed by atmospheric warming (having to do with patterns driven by the Rockies) and northwestern Europe's natural enjoyment of a "maritime climate". In other words, western Europe has mild weather because the wind comes from the west, over the massive heat sink of the Atlantic, and from the south, due to the atmosphere rebounding from its prior subarctic swing over southeastern North America.
The *logic* seems solid, although I naturally know next to nothing about the model-work, nor do they really offer any details. But essentially, they're arguing against the idea that a sort of Young Dryas redux is anywhere in the cards, and seem to suggest that any modern shut-down of the North Atlantic Conveyer by global warming will be swamped by the accompanying warming itself, leaving western Europe pretty much at scratch.
Link via Jonah Goldberg at the Corner.