But we do have to consider how the speed in which it is dropping. China uses about the same percentage of fossil fuels for energy production as the US right now, but more of it is coal so it is dirtier. However they are aggressively installing and promoting renewables and nuclear power, built themselves, and their pollution standards are rapidly increasing. While in the US renewable and nuclear investment is and has been pretty crappy.

This comparison is meaningless because China is the worlds factory (including a major portion of what's consumed in the US ). So that CO2 number is their populations usage plus what's required to manufacture good for the most of the world. A huge part of US CO2 consumption has been outsourced to China.

4x the people and 10x the industrial output for less than 2x the carbon? Incredible efficiency