China's CO2/kWh is going down reasonably quickly for a growing economy. They could do a lot better of course (couldn't we all?), but they're not just building coal plants; they're also building renewables and nuclear. "China does X Y-times more than other countries" is a headline that can be recycled for almost every topic. There are 1.4 billion people in China.
I think they do care (they are also number 1 in rollout of most renewables), but they care more for social stability, that they can only sustain with high economic growth.