It's a problem because it's a digital currency? Because many other things that could be considered "surpeflous" also consumer massive amount of electricity. Or

It's a problem because it's a digital currency? Because many other things that could be considered "surpeflous" also consumer massive amount of electricity. Or for example (not superfluous but potentially equivalent) how much electricity all the global banking system uses? I bet that it's more than "a nation".