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> Ethereum, the second most popular blockchain, uses about 1000x less energy per transaction

That can't be right.

Bitcoin and Ethereum use comparable amounts of power according to the daily rewards available (column "PoW Produced (24h)" in [1], while Ethereum's transaction rate is barely 5x greater than Bitcoin's.

[1] https://www.f2pool.com/coins

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This is definitely a lesson to me to include sources in footnotes - I think my source here was googling "energy usage ethereum transaction" and using the info card at the top of the search page, which appears to be from https://www.weforum.org/agenda/2017/12/bitcoin-consume-more-... and... is an outdated and not great source.

Noted that my numbers for Ethereum are almost certainly not correct, but I think the point still stands that "the carbon footprint of crypto and blockchains depends hugely on which blockchain you're talking about"

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