John Kerry: “I applaud their commitment to diplomacy and I appreciate their ability to negotiate significant limitations on…”

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.

Obviously, we're already seeing ways in which it's going to affect people.

I have to admit to you, if anybody thinks it is radical to care about the protection of this planet for future generations, sign me up.

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