From Dave Holtum, Bathampton, Somerset, UK
You indicate that we can expect more extreme weather with a wavier northern polar jet stream. I suspect this is even more likely when you consider the effects of an apparently weakening Gulf Stream and its interaction with the jet stream.
One possible effect of a disrupted Gulf Stream is a cooling of Europe. Maybe this will cancel out predicted warming. I suspect, though, that the outcome could be more extremes of cold and heat.
