John Kerry: “I am very concerned about Iran's nuclear ambitions.”

It's very obvious that there are huge threats here.

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.

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

We do not trade any component of any of those other issues for what we are trying to do on the climate front.