[moneyrunner]

Would you go a step farther and agree that the sun is orders of magnitude more important to global temperatures than all of the human activity ever performed?

[palmer]

The sun is orders of magnitude more important than any greenhouse effect and any changes in greenhouse effect that man may have caused. However, the changes in the sun are relatively small compared to changes in other natural and manmade factors. I also believe natural (including solar) are more important than any manmade changes, but I can't quantify how much more important.