That makes no sense. We don't have enough renewable electricity yet to replace existing electricity consumers, and 90% of energy consumption is non-electricity

That makes no sense. We don't have enough renewable electricity yet to replace existing electricity consumers, and 90% of energy consumption is non-electricity and will still need to be switched over to be electric (insofar as we can), let alone if we invent a new waste of electricity in the form of a get-rich-quick-scheme. We don't need more problems. Don't use proof of work systems, or admit that you're in it for your personal gain and the planet can turn to semi-literal hell for all you care.