This is wrong though. During the sale, the fees were much higher, but the CO2 emissions remained constant. It's just not the case that you can "talk about gas

This is wrong though. During the sale, the fees were much higher, but the CO2 emissions remained constant. It's just not the case that you can "talk about gas fees in terms of tons of CO2". You should talk about the CO2 emissions of the Ethereum network. It's not 1:1 with fees in any sensible way.