Polar Vortex winter caused by global warming:

http://phys.org/news/2014-05-climate-scientist-extremely-cold-winter.html

So added heat in the south pacific caused the the jet stream to skew, resulting in that terrible winter of 2014 in the US.

I just bet some desperate moron here is now desperately thinking about choosing to confuse weather with climate in order to claim this local temporary cold snap contradicts the global warming theory. Must we point out the difference between weather and climate yet again?