>Regardless of all of that, Ethereum will be on proof of stake within a year (wouldn't be surprised if it's 3 or 4 months at this point), at which point the CO2 argument will go away altogether).
It looks like it changed pretty dramatically since you posted (it's now at a 24% chance of occurring before the end of the year). This site [0] uses actual money, and more closely lines up with what I expect (although still more pessimistic than I am).
Quoting for posterity.