Mabey I should shed a little more light on why I came up with this. I saw a documentary on the Science channel about Earth's magnetic field weakening. Supposedly, this could be related to the galactic allignment we are about to cross in 2012. When we cross the "equator" of the galaxy, our magnetic field is supposed to collapse completely and restart in reverse. We have evidence of this happening in the past by studying cooled volcanic lava. As I said in the original post, I don't think the "o-zone" layer really exists, which is why I don't think pollutants are causing global warming. Some scientists attribute the failing of the magnetic field to our global warming. I think this is more reasonable that an "o-zone" layer with a hole in it. I don't think the extra heat our things are making are helping in any way, but you have made good points about how it would minimally effect our global temperature.
However, some scientists think the magnetic field will not change for a few thousand years. Most still do agree it is weakening and contributing to global warming. The planet is getting hotter on average. Whether or not we can do anything about it is the question.
One person earlier mentioned Mars getting hotter as well. This would help to prove the galactic allignment will reverse the magnetic field. We should also be noticing temperature increases on every other planet in our solar system as well if this is the case. I have not heard anything about temperature on the other planets.
I have moved and do not have the internet at home, yet.
