I'm only slightly exaggerating when I say that the rest of the world is a footnote to China's emissions. Europe's emissions are already dropping fast, though. Presumably if China can decarbonize its economy at the rate it's going, then we presumably the rest of the world (even poorer nations) will be able to fast-follow them due to the learning curve (or else just because China will have so much excess manufacturing capacity that they'll flood the world with cheap renewables.)