No need for that kind of grunt work, plenty of people have wandered that before you. China trade alone has a smaller impact so here’s numbers based on total net imports - exports:
https://ourworldindata.org/consumption-based-co2In 2000 US emissions totaled 6.01 billion tons vs 6.25 billion in terms of consumption.
In 2021 that then drops to 5.03 billion tons total vs 5.57 billion in terms of consumption.
To scale per capita numbers divide 6.25 B / 281.4 million in 2000 and then multiple by 331.8 million in 2021. Which suggests 7.4 B T if we had done nothing vs 5.57 = a gap of 1.8 B tons over a shorter period.
> You do realize that it is still largely enough CO2 to make large portions of Earth (around the equator) literally unliveable for humans? Meaning that billions of people will have to relocate, meaning global instability, wars and famines absolutely everywhere, right?
The projections that suggest larger areas become uninhabitable assume massive contributions of CO2 from coal which are already unrealistic. Roughly half the the words coal is being burned in China but they are transitioning fast. “In 2020, China committed to have 1,200 GW of renewables capacity by 2030, but is on track to meet that goal five years early.” They added 216 GW of solar PV in 2023 alone, meanwhile demand is increasing by around 6% / year, so rather than just slow coal power plant construction it’s looking like they are going to start significantly curtailing coal electric production in 2024.
It’s said that 1.5C assumes China will end coal use by 2060, but the sooner they start cutting the longer they have to finish.