Consider: Bitcoin's energy usage is not a flaw, it's like that by design. It's the only way Satoshi could make bitcoin censor resistant.

You have to invest a valuable, scarce resource in a trustless way to contribute to the blockchain, and he saw no other way (and neither do I).

Also, the more energy the bitcoin network uses, the more expensive it is to attack. Consider how much is spent, not only in energy, but production, and carbon emissions to protect value from attacks by adversarial forces. Vaults, military, police, weapons, buildings, laws, lawyers, accountants, auditors, etc. Bitcoin only uses energy (much less of it), which can be procured in a green, more efficient way.

I'm gonna repeat this, to debunk what is becoming common parlance even in this very forum. Bitcoin's energy usage is not a problem, it's a feature. Civilization hasn't advanced through its history by using less energy, but using more. The problem is never energy usage, it's energy production.