I mean, I don't know it for sure, that's why I said "to the extent..." but here is one article https://www.bloomberg.com/view/articles/2017-12-07/bitcoin-is-g

I mean, I don't know it for sure, that's why I said "to the extent..." but here is one article https://www.bloomberg.com/view/articles/2017-12-07/bitcoin-is-greener-than-its-critics-think https://www.bloomberg.com/view/articles/2017-12-07/bitcoin-i...