John Kerry: “It is the President, as Senator Lugar said, who must show the way.”

We are competing, but everybody has their own approach, which is one of the exciting things here.

Nothing is agreed to until everything is agreed to.

Obviously, we're already seeing ways in which it's going to affect people.

the U.N. Finance Analysis suggests that it will cost trillions of dollars. Maybe $2.5 to $4.5 trillion a year between now and 2050.