Let China clean their own back yard first.
He can negotiate it (however unlikely that may be) but Obama will never be able to get the Senate to ratify a global climate treaty in 2015. Remember, it takes a 2/3 majority.
From Wikipedia:
In 1978 the United States banned the use of CFCs such as Freon in aerosol cans, the beginning of a long series of regulatory actions against their use. The critical DuPont manufacturing patent for Freon ("Process for Fluorinating Halohydrocarbons", U.S. Patent #3258500) was set to expire in 1979. In conjunction with other industrial peers DuPont sponsored efforts such as the "Alliance for Responsible CFC Policy" to question anti-CFC science, but in a turnabout in 1986 DuPont, with new patents in hand, publicly condemned CFCs.[9] DuPont representatives appeared before the Montreal Protocol urging that CFCs be banned worldwide and stated that their new HCFCs would meet the worldwide demand for refrigerants.[9]
Let's see, 1986 plus 34 years (issuance term plus renewal) is 2020. Any bets on whether DuPont has a replacement for HFC?
CFC’s and HFC’s are by far worse than CO2 but the article is wrong. China is the worst polluter.