No, wasting energy is not why blockchain works. proof of work is just one way a blockchain can work. There are alternatives: https://www.stellar.org/develope

No, wasting energy is not why blockchain works. proof of work is just one way a blockchain can work. There are alternatives: https://www.stellar.org/developers/guides/concepts/scp.html https://www.stellar.org/developers/guides/concepts/scp.html disclosure: I work at stellar