First, if the sun isn't putting out more energy, then why are the ice caps on Mars melting?
Second, Most of Europe and North America were covered with ice around 15,000 years ago. Obviously it got significantly warmer since that then. If everything is man's fault, what happened then?
Clearly the planet is not static. It is constantly changing. To think we can just freeze the climate into a particular state is just plain foolish.
Oops... "... since then."
It's those two rovers the eeeevil U.S. sent to Mars. They're really SUVs. *twirling moustache* Muah-hahahahaha!