[phocion]

This concern usually stems from the idea that the energy used by the Bitcoin network could be otherwise used for more productive functions. But if, like many, you believe that bitcoin can succeed in becoming a decentralized world currency, the reality is that there may be no greater, more important use of energy than to secure the integrity of a monetary network which coordinates economic activity at a global level.

I highly recommend this piece (which I'm paraphrasing here) if you're interested in the topic:

https://unchained-capital.com/blog/bitcoin-does-not-waste-en...