What? This is such a irresponsible way to phrase it.
But also, I tried $Nano and it's notable, really elegant solution to the immense energy use of traditional crypto currency systems.
So I agree with you here, but I belive that the energy use of Bitcoin is not wasted, is to prove a poind that we can create a robust unhackable digital monetary system.
Once the experiment is over we will cut this energy use gradually until we are left with an efficient, secure and solit digital monetary system that is sustainable. (Unlike gold, for contrast)