I feel like a trojan that hijacks all existing blockchains and kill them would do more good to climate change than any other idea we could possibly come up with

I feel like a trojan that hijacks all existing blockchains and kill them would do more good to climate change than any other idea we could possibly come up with. We are burning an awful amount of electricity on something that's not being used for any practical purpose but only by speculators and "investors".