My nomination for stupidest thing I've heard on this subject.
What, pray tell, IS the correlation? Or is it just some grand coincidence that they are ALL warming at the same time?
Our planet is warming a bit and other planets and moons are warming and maybe cooling a bit for various reasons. The only reason we would have in common would be changes in solar irradiance, but that change (increase) is small, something like 0.1% per century (IIRC). The other solar effects that might warm our planet like the cosmic rays that get by the sun's magnetic field are applicable to our planet, not the others. So the correlation to other planetary warming is weak, if any.