I'm not a firm 'believer' nor a strong 'denier'.
From what I understand, it's the (average?) temperature of the whole earth that is rising. So that mean that it could affect this stream of warm water, or perhaps divert some dominant winds. Basically, that mean that we are supposed to see a reshuffling of weather systems, witch could very well explain why you guys in the US and Europe have more snow, while we in montreal don't get shit this winter. Our summer are also starting to looks similar to those of the UK (rainy and boooooring).
That being said, I'm not sure why everybody is making such a deal with all this. I mean, isn't it a great thing that we try to reduce the amount of crap we output everywhere? We all know that we breath, eat and drink all that crap as well. So really, this ol climate change debate is almost meaningless to me.