Crypto is also heavily used by criminals and terrorists to finance their harmful activities. Using crypto makes you guilty of aiding and abetting the criminal establishment, so I would shy away from using Bitcoin, Ethereum... you know, let's burn the dog and his father, too.
What you're thinking about decimating our planet has to do with Non Fungible Tokens or NFTs. They take a crap ton of computing power to create and to sell or exchange, so they cause fossil fuel use to go through the roof when making and exchanging them. I agree. We should outlaw all crypto use and criminalize the usage of such an illicit asset if we wish to save our civilization from heading down to the cesspool. Oh, what do I know about saving the world? I'm just a game developer... :-D