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> CO2 molecules have no nationality

if that's the case, why do you think american citizen deserve to pollute a lot more than Chinese citizen? why would being born inside US border somehow makes it ok to pollute more than if you were born inside china

By your logic, if China were to split in 150 small countries, they could pollute as much as they like because technically each of them would be low on the list of highest emitter.

> And at the end of the day, CO2 molecules have no nationality

...which is why per capita is a better measure than per country. Here's a comment from a while ago that shows the math [1].

[1] https://news.ycombinator.com/item?id=29040704

it's so obvious that per-capita metrics are a far more practical metric to use that I am convinced those repeating this flawed argument have no real interest in tackling climate change