So which is it? I'm confused.

Snow is a thing of the past because of global warming. This makes sense. If the world warms up then colder areas become warmer and they will get more rain and less snow. So far, so good.

Except that, as CO2 has increased so has Northern Hemisphere snow cover. 

So now we need an explanation that makes sense and agrees with reality. and so we have 'Global warming could cool down temperatures in winter.'

As reality plods along and ignores the prognostications of some climate scientists theories are 'saved' by devising alternative explanations that now correspond to reality.

First, heat-trapping gas increases cause less snow by increasing winter temperatures but if that doesn't correspond to reality then heat trapping gas increases can cause cooler winter temperatures and more snow. Perfect theory. It can't be falsified and we can continue to demonize a harmless trace gas essential to life on earth. Yeah! (jumping up and down).

Only trouble is: the Arctic doesn't appear to be warming. The Summit camp in Greenland is at record cold in 2011. Nuuk on the west coast of Greenland is not warming.

The Arctic has undergone periods of warming and cooling in the past just as other areas of the earth have experienced. Cycles are the norm and increasing CO2 has nothing to do with it.