"I do think that climate change is occurring, that it is man-caused. One of the proposals that I think is a very libertarian proposal, and I'm just open to this, is taxing carbon emission that may have the result of being self-regulating. ... The market will take care of it. I mean, when you look at it from the standpoint of better results, and actually less money to achieve those results, that's what is being professed by a carbon tax."