Posted 1 January 2013
This paper states that there are two strictly separate thermodynamic mechanisms at hand to explain surface warming. And hence we have a way to determine how the observed global warming of the recent three and a half decades came about. Through which of these two mechanisms was the global surface temperature raised?
This is important:  
The atmosphere can ONLY change the surface temperature INdirectly, that is by
   changing the net energy OUTput – heat loss.
So, who is the culprit? The Sun or the Atmosphere?   
To find out, read it all here