I'm not a climatologist or even a weatherman, so go ahead and take this with a grain of salt, but global warming could very well freeze over Europe, or at least England. The idea is that England is as far north as say, Novia Scotia (I think) or Norway, but has a temperate climate because of warm water running up from nearer the equator, which carries warm air with it. The reason this happens is because hot normally runs to cold. The idea goes that as temperatures around the arctic increase, there becomes less of a temperature difference, and so the warm water stops flowing up there. Since that stops the current of warm air running up to warm England, it freezes over like Siberia. Something along those lines anyway.

Anyway, I can definitely see it in action where I live - when I was young, it never rained in winter, only snowed. The past couple years, however, during winter it has rained more than it has snowed. Hell, even the pentagon feels its a national security issue.