Purely out of curiosity:

- 100 kg carbon per NFT [1]
- 180 tons steel per Richard Serra "Snake" [2]
- 1.85 tons (1,678 kg) CO2/ton steel [3]
= ~300,000 kg CO2 per "Snake"
= ~3,000 NFTs

[1] https://github.com/memo/eco-nft
[2] https://artdex.com/art-world/greatest-minimalism-richard-serra-and-giant-cor-ten-steel/
[3] https://www.mckinsey.com/industries/metals-and-mining/our-insights/decarbonization-challenge-for-steel