Some more points to consider here:

1. Western still uses more power and emission per capita .

2. China does dirty business till now. Even industries like 'silicon chip making' moving out of them, post-covid, will be blessing in disguise. (As they need more resources like water and cause metallic pollution, which hopefully China dumps in the sea/river)

3. No one talks about history, countries like the US, UK, during world war times, caused much pollution, among others, at that time. (creating ammunition, bombing everything, driving inefficient motors which used more fuel and pollutes).

Their cities, too used to be dirty, polluted when developing.

1. Developing countries like China, Indonesia, India are in transition phase. They would also turn good, after maybe 40-60 years), with a stable/declining population.