Per capita, it's not the "3rd" world countries that are polluting, but the "1st" worlds (https://cotap.org/per-capita-carbon-co2-emissions-by-country...). I'm sad to see someone still referring to countries as "1st" and "3rd" world, as that's an incredibly outdated term. Also to refer to China as a "3rd world country" is astonishing. I recommend you read the book Factfulness (https://www.gapminder.org/factfulness-book/) to get a better sense in how the world works.