> This sort of ignores the global nature of our supply chains though. To me the answer is a pretty easy one: Take the CO2 emissions of a country and divide by

> This sort of ignores the global nature of our supply chains though. To me the answer is a pretty easy one: Take the CO2 emissions of a country and divide by its GDP. That gives you a CO2 per dollar. Then decide on a CO2 cost per unit for your country. Now apply that as a tariff per dollar of imports from said country. It's imperfect, of course. But I think it is close enough to estimate what we want it to do.