Biggest problem about PoW coins, and that's something that everybody working on it knows, or should know, is that the need of power is steadily bigger each year. Where would be the limit of that? When that requires the energy of a big country? (We are quite away from that as far as I know [1] ) A heavily industrialized continent? More than the whole world?

It's absolutely crazy. I know that there's a big lobby behind mining, I absolutely respect what they have being doing protecting Bitcoin i.e. and making the project survive... even if it somehow completely lost it's original purpose. But FFS guys what's the purpose of having cryptocurrencies if the cost of that is aiming to destroy the world, or much more probably, to win a last minute complete cryptocurrency ban from all governments with the handy climate change as an excuse?

[1] https://www.thebalance.com/how-much-power-does-the-bitcoin-n...