People have been warning PoW was a technical dead end due to energy waste since 2013.
The Eventual PoW mining ban by every country of the earth is a foregone conclusion.
That is the phase we are entering now.
The bitcoin cults nutjobs will just scream fud like when China banned it.
But China still banned it.
Ethereum is switching to Proof of Stake, to solve their PoW problem.
China didn't ban bitcoin because of environmental concerns. They take poor care of their environment as it is.
They banned it because they fear open networks such as bitcoin. They do not like having ANYTHING that cannot be censored one way or the other.
POW is not a bug in bitcoin, but one of its most important features. Don't get it twisted.