*UPDATE* Newt has responded to your comments below! CLICK HERE to read this latest response to you!

Visit ContractWithTheEarth.com for more on green conservatism

Many of you have written to me to ask why I recently taped an advertisement with House Speaker Nancy Pelosi for The Alliance for Climate Protection, a group founded by former Vice President Al Gore.

I completely understand why many of you would have questions about this, so I want to take this opportunity to explain my reasons. First of all, I want to be clear: I don't think that we have conclusive proof of global warming. And I don't think we have conclusive proof that humans are at the center of it.

But here's what we do know...