Good. Very good. This may be a radical take, but I think nations should introduce some unprecedented legislation: ban trade of proof-of-work cryptocurrencies. Don't ban their trade because they make poor financial products, either because of rampant fraud or criminal activity. That's a different argument and requires different approaches. Ban their trade because global society shouldn't accept rampant incentives to l…
So burning electricity on running a cryptocurrency is not right, but burning electricity on running servers for Facebook or user tracking is all right? If that's the case, who's the arbiter of what's "too much" power for a use case? If that's not the case, how do you propose to enforce that all use cases use less electricity, and how do you punish those who use too much?
Don't address of any the things that you are proposing need addressing, because they don't need to be addressed in the same law, or really addressed right now at all.
The law doesn't need to try and anticipate the actions that occur in the future, we will still have a legislature in the future capable of addressing the future when it comes about. The law needs to address the actions of today.