John Kerry: “There's just no need to sully or dampen, or anything, the tremendous opportunities that you have.”

The message is, let's find a way to be able to make sure when we fly, we're not leaving emissions that we cannot capture.

I mean, we try to help the world.

Without a border protected you don’t have a nation.

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.