For the record, I'm not trying to defend BTC's energy footprint. It's a black-eye on the tech and a problem that needs to be solved. Proof-of-stake over proof-of-work is an interesting solution, and part of the reason I hold a lot more ETH than BTC. That's why I'm so interested by cryptos though -- BTC just opened the door and the derivatives are where the real innovation will happen in my opinion.