Global Warming to be cut by 20%

In the W.P. today, they had a brief article about plans to cut emissions by 20% by 2020. I read a recent article from duvafiles, I believe from the W.P., that said China and India are the two biggest pollutants (that don't go moooo). So, what are we going to do? Are we going to police those countries? Or is it fine to assist a country's betterment as long as it has backing from the left?