https://www.collinsdictionary.com/dictionary/english/per-cap...
Some useful terminology for your journey.
Imagine you have a buffet. You have five people who each take 1 steak. Then you have one person who takes 4 steaks.
You are the person saying the one person taking 4 steaks is okay. The problem is the selfish four people who are eating 1 steak each. If they all stopped, the other guy could have 9 steaks.
Which is of course a silly proposition. The one guy could simply eat fewer steaks.
China is also the center of world manufacturing. The fact they make almost everything on earth but still have lower per capita emissions than the US is impressive.