That damned fusion reactor overhead is overheating:

"The Sun is in a changed state. It is brighter than it was a few hundred years ago and this brightening started relatively recently - in the last 100 to 150 years."

Dr Solanki said that the brighter Sun and higher levels of "greenhouse gases", such as carbon dioxide, both contributed to the change in the Earth's temperature but it was impossible to say which had the greater impact.

This is probably a better explanation for global warming on Mars than SUVs.

It should also be noted that Salanki hasn't always held that view--he previously (i.e., a couple years ago) thought that greenhouse gas was more important than solar forcing.