On: In theory, rocks from Oman could store hundreds of...

[graeme]

How would you make it work in practice? Would every country sign a global accord to tax oil wells, coal mines, etc?

Or would you have an import tax on such materials? How exactly would you adjust taxes at the border?

I also think this is the best solution, but I'm not exactly sure how you'd implement it without loopholes.

[skosch → graeme]

Yes, import taxes would be the temporary solution. This is my go-to resource: https://citizensclimatelobby.org/carbon-fee-and-dividend/