[Groxx]

That's generally the idea of a flat tax, yeah. Tax everything at point-of-collection/creation (e.g. "you cut down a tree" or "you burned a log") or point-of-import (likely offset for similar taxes collected by the origin country), and there's no need to track anything beyond that point. E.g. re-use or re-selling is (CO2-)tax-free because it doesn't change the net input/output of the whole system.

Which rarely happens in practice, and we're so far from accurately taxing all these processes that it isn't even a dream of a dream. It's mostly tackling big targets, since that's where a ton of the impact-per-dollar-and-per-outrage can be found.