Very interesting article.
One should note that while Europe was cold, the rest of the world was quite a bit warmer. In fact, in spite of a strong La Nina, and the severe derth of sunspots, 2008 came in at either 8th or 10th warmest on record. And 2009 essetially tied the second warmest on record.
So thus far, if the sunspots do indeed indicate less energy recieved from the sun, and the solar observing satellites indicate this was the case, although the decline was slight, then the fact that there was little impact on the increase in heat in the atmosphere and ocean, seems to indicate that the GHGs are a major influence on the heat balance of the earths surface.