We kinda enforce "don't trade slaves" globally... And "No child labour"... And "don't steal other countries ships when they sail near your country".

"Don't emit more than your fair share of carbon" is just another rule like the others. If most countries agree, but there are a few dissenters, we can deal with it like other international disagreements - warnings, then sanctions, then war.

Currently, we're far from that, because we don't have a majority of countries agreeing on carbon caps.

So the British Navy is gone blockade Africa so they cant import oil from the middle east? Great plan.

Nah - it'll go down like Venezuela [1]. The government of a country flagrantly ignores the internationally agreed carbon caps, and so some country or group of countries get together and sponsor a coup.

It happened to Venezuela because they refused to align with US interests, and with other economic and political issues, they were an easy target. The wikipedia page [1] has a nice summary of the list of countries on each side of the dispute, and you can see a nice 'pro USA' and 'anti USA' divide.

[1]: https://en.wikipedia.org/wiki/Venezuela#Since_2018

Sponsoring foreign queue is not actually that easy.