'Mars and Pluto are warming too'
More from the Grist Mill on how to argue with a climate skeptic.
Faced with the proposition that CO2 creates a layer in the atmosphere that traps heat, thus warming up the Earth, the deniers can't really say anything.
So instead they argue that climate change is occuring across the solar system, so it must be a product of increased solar activity from good old Sol 1 not CO2.
However there is no evidence that the rest of the solar system is warming.
Read more here