John Kerry: “Both sides are preparing for what may be the final showdown.”

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.

We are not, I have not, President Biden has not, we are not saying to people, you should not fly.

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.

It's a matter of mathematics and physics, not politics, not ideology. It is a response to the science.