John Kerry: “I happen to agree with General Chilton that we should not constrain our engineers and scientists.”

You cannot just sit there anywhere and wish that things are going to be as they have been historically.

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

Would not it make a lot more sense if we were avoiding that damage in the first place, or minimizing it?

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.