[Donald Rumsfeld Fan]

The fact that the planet has warmed and cooled in the past does not prove that humans are not responsible for warming this particular time.

Natural or caused by mankind?

I'll place my bet on millions of years of climate history than some dubious computer models that it's natural.

[EdnaMode]

But just incase it's manmade, I think every celiberal should have their mansions torn down and hundreds of trees grown in in their place. Then they can move into apartments and take public transportation to work.