John Kerry: “I think that many more people are responsible for the mess that the Bush administration has gotten us into.”

That hasn't happened sufficiently.

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

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.

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.