John Kerry: “I believe the best way to curb that and reduce the threat is by acting.”

In terms of global challenges and U.S. interests, yes.

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.

But, we could with battery. We could with-- there's ways to make that work.

The message coming out of this COP is, we are moving away from fossil fuels. We are not turning back. That is the future.