Proof of Work is far superior to Proof of Stake in a network with absolute fairness (security) being fundamental. Satoshi himself said he could find no other way.
Compare energy spent on global hash rate to all energy spent by mining metals, physical banking, financial services middle persons, etc. if you want to talk about energy usage and make any kind of sense.
Compare energy spent on global hash rate to all energy spent by mining metals, physical banking, financial services middle persons, etc. if you want to talk about energy usage and make any kind of sense.