Perhaps more worrying than this change is the recent focus on expanding China's coal plants [1]. China already now is responsible for 45% of the global coal electricity. Just look at this diagram [0]. And with their one-belt-one-road initiative, they are building coal plants around the world. [0]: https://www.carbonbrief.org/mapped-worlds-coal-power-plants [1]: https://www.forbes.com/sites/judeclemente/2019/01/23/coa…
China is still only a moderate emitter per capita, though it's caught up to Europe in recent years. Considering the wealth disparity it's a little hard to criticize.
The consequence of having 1.4 billion people in your society, is that you don't get to pollute at the rate of a nation with one million people that outputs 10x more pollution per capita.
Is that unfair? No. I don't think per capita equality of pollution is the most important factor in this. As a society China has to bear the consequences of their immense population and its impact on the earth. Pre-emptively I'll note this isn't a defense of any other nation's high per capita pollution output level.
Globally we have to take the China output very seriously, and we can afford to not be nearly so concerned about the 10x output of the one million person nation because it's not a dire threat to the planet (which isn't the same thing as not caring about their output, it's a difference of one threatening human existence and the other not; I'm far more concerned about North Korea's nukes & missiles than the localized authoritarian militia activity in a tiny nation - even though they might both be reprehensible governments, one is far more dangerous).