I'm not arguing that data centers aren't power hungry but I will say that I'm a bit concerned that proof-of-work crypto-currencies are consuming way more power

I'm not arguing that data centers aren't power hungry but I will say that I'm a bit concerned that proof-of-work crypto-currencies are consuming way more power than the coins will ultimately be worth. I know that bitcoin has made millionaires but I still can't spend it at my grocery store.