There are multiple solutions, but all requires that the our current power structure decide and commit to solving them. So far there's no consensus on any level

There are multiple solutions, but all requires that the our current power structure decide and commit to solving them. So far there's no consensus on any level. (Meaning there are not enough people at any level to force, or agree/compromise, or influence the economy, or make it the dominant single issue politically/culturally.) Sure, participating in it by buying, mining PoW coins (or basically any coin that then - due to hedging/diversification - leads to even more PoW coin mining/demand) while knowing about the external cost is morally problematic. However the actual harm is likely less than doing many-many other selfish (immoral/bad) acts. If the early crypto billionaires exit crypto and put their newfound wealth into effective altruism the moral calculus changes very starkly.