We need altcoins as long as we interact economically over the net, with people we do not know (or simply with people outside our local communities). If we try to imagine what qualities a “solarpunk coin” should have, what are your thoughts? Do we know any existing coin, checking all boxes? This question is more about political economy of Solarpunk, then its technology.
I’m aware not all coins are proof-of-work mined using coal generators. Proof of stake isn’t punk either.
In all honesty there’s nothing to make better, I believe the central issue with crypto is that it doesn’t solve any real problem.