https://www.zmescience.com/science/news-science/bitcoin-now-consumes-more-energy-than-argentina/

https://singularityhub.com/2019/10/27/towards-a-scalable-efficient-cryptocurrency-bitcoins-new-low-energy-competitor/

To take the place of the current renditions that exist today, a cryptocurrency of the future will likely need to be more energy efficient, transaction efficient, fungible, and decentralized.