I disagree with the last part about direct proportionality between energy and money. But my real wonder is if we can use this hashed/mined out coins for something that is actually useful socially.(even if it is a transaction of services anonymously.) I keep wondering if we can create a crypto currency + IOT devices + energy tracking system that can value the coins you have based on the energy sources that fed into mining it. But it feels so complex that I am not optimistic about creating such a thing..