Meanwhile, China's emissions jumped by 123% over the past decade and now exceed those of the U.S. by more than two billion tons per year. Africa's carbon-dioxide emissions jumped by 30%, Asia's by 44%, and the Middle East's by a whopping 57%. Put another way, over the past decade, U.S. carbon dioxide emissions "about 6.1 billion tons per year "could have gone to zero and yet global emissions still would have gone up.