But what would we do, how are we going to tell China or India, sovereign nations whose people are emerging from abject poverty, to knock it off? These nations are on a year over year increase path that by 2030 will see them doubling their CO2 emissions.

Are you willing to give them money and how much, what if they do not use it for appropriate actions?

Are you willing to force them to change, how do you propose forcing them? Are you willing to wage American lives now for a future probability?

The United States of America has done a great job reducing its environmental impact. Back in the day it was a rare event to see stars in Los Angeles because of the fog (the gaseous burning orb ones not the celebrities), but thanks to the EPA, it is a common occurrence now.