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Blockchains are moving away from PoW to PoS, which requires a millionth of the energy use, so that's not really an argument.

Kindly elaborate. Which ones? To what extent? What is the state of the art here?

This was my only issue with bitcoin when I evaluated it several years ago.

Pretty much all the newer ones, Nano, Iota and Eth probably soon to.

There is also a debate to use delegated PoS or a hybrid of PoS and PoW to get both of their upsides with none of tbeir downsides.

Iota is not a blockchain. It's also not a cryptocurrency. It's about 98% scam and 1% insane. and 1% Bosch.

Yes, 3rd gen blockchains aren't blockchains anymore. :)

> There is also a debate to use delegated PoS or a hybrid of PoS and PoW to get both of their upsides with none of tbeir downsides.

Read: PoS has downsides.

So does cash

Yes that's why they hybrid.

The casper-ffg paper is a pretty good spec for a hybrid PoW-PoS system, and is IMO a good place to start before looking into full PoS systems