It goes like this. China can continue to create as many carbons as it wants, growing its economy cheaply while we will cut ours drastically.
the United States pledges to impede its own economic growth right now, in significant ways, while China will be free to continue building coal-powered plants, expand its economy and cement its place as the world's leading polluter -- perhaps even doubling its output against ours
http://www.realclearpolitics.com/articles/2014/11/14/the_us-china_climate_change_deal_is_terrible_fortunately_it_doesnt_matter_124658.html
the United States pledges to impede its own economic growth right now, in significant ways, while China will be free to continue building coal-powered plants, expand its economy and cement its place as the world's leading polluter -- perhaps even doubling its output against ours
http://www.realclearpolitics.com/articles/2014/11/14/the_us-china_climate_change_deal_is_terrible_fortunately_it_doesnt_matter_124658.html