My fine friends who are perfectionists, each in their own world where they are petty dictators, could write a perfect bill. Those of us who have grown up and matured...understand that we have to work together on the big issues.

I think Putin has already gotten used to the idea of Obama and his secretary of state, John Kerry, making noise - it just doesn't seem to impress Moscow at all.

I don’t think we have conclusive proof that humans are at the center of [global warming]

I think that Donald Trump is very concerned about finding the right way to be effective in a responsible way. And he wants to be effective.

I think if you have mandatory carbon caps combined with a trading system, much like we did with sulfur, and if you have a tax-incentive program for investing in the solutions, that there's a package there that's very, very good.

I think Ron Paul's views are totally outside the mainstream of virtually every decent American.

Established systems are inherently hostile to change.