John Kerry: “In the absence of doing this, there will be a grant of impunity to Bashar al-Assad for the use of these weapons.”

It is not fair for us to be reducing.

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

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

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.