[phil-m]

You can achieve this without Proof of Work, but unfortunately Bitcoin will probably stay forever with this Consensus algorithm (considering the circumstances).

Bitcoins energy consumption is disproportionate to the value for the societey it has.

[jerry1979]

How do you evaluate energy consumption vs value for society? Some see it this way: Bitcoin has a revolutionary potential to bring the global south out from under the financial thumb of the global north. We can see glimmers of this unfolding now in El Salvador as they implement Bitcoin as legal tender.

Also, given that point-of-source green energy is cheaper & more politically stable than fossil fuels, shouldn't we expect to see greener and greener Bitcoin mining? In fact, China banned Bitcoin mining in it's coal regions and then more recently throughout the country. Meanwhile, El Salvador plans to build mining facilities using geo-thermal power.