[andersonvom]

The US has a little over 4% of the world population, yet it's responsible for 15% of carbon emissions [1]. Even if the US is the only country to implement it, it would already make a huge difference.

[1]: https://en.wikipedia.org/wiki/List_of_countries_by_carbon_di...

[fjsolwmv]

So USA could breed a huge population of impovershed underclass to bring average emissions down.