If this is true, BTC uses way more energy than fiat. You have to remember that there are more euro transactions than btc. I don't have numbers here but I believe the difference is huge. For me, its obvious that btc uses more energy and that is bit of a problem to the environment.
I think there are miners here who are scared to lose their profits and so they try to mess up the discussion or any evolution. But maybe they are just idiots. Whatever, don't mind.
You don't have to be from Nothern Europe to realize the crazyness about this limitless voracious PoW.
I believe it can be implemented to be more energy efficient with no major change for anxious miners
(For speculation, if energy becomes too cheap, wouldn't it mean that pow loses its meaning, too)
not at all
but it won't solve the problem because cheap mining will attract more miners