It's running proof of stake, successfully for over 512 days!

Uses validators instead of mining, the power footprint of the ENTIRE network was reduced by 99.995%.

Crypto isn't power inefficient, BITCOIN MINING is power inefficient.

Can't wait for the typewriter (Bitcoin) to be replaced by the computer (Ethereum).

Ethereum switched to proof of stake a while ago. So yes. Hardcore crypto fans don't like it because theoretically it could be subject to the 51% attack. Personally, Ethereum is big enough where

A) I don't think that attack is likely and B) the efficiency gains are worth the risk

Disclaimer: I have Ethereum so i benefit from other people buying it. I do honestly think it's better for the environment.

PoS instead of PoW is about 1000x more efficient, meaning that instead of being about 1,000,000,000x more wasteful than the work it effectively does it's only about 1,000,000x more wasteful.

Ethereum is using proof of stake now.