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 stilled banned it.

Ethereum is switching to Proof of Stake, to solve their PoW problem.