Let's wipe out any distorted fact about bitcoin mining and power cost, carbon emission effects from mining activities. Let's get started with that topic
Debunking the "Bitcoin is an environmental disaster" argument.Another viewpoint from @satoshi. Again, satoshi proved he is in advance of one's time. Truly a genius guy.
It's the same situation as gold and gold mining. The marginal cost of gold mining tends to stay near the price of gold. Gold mining is a waste, but that waste is far less than the utility of having gold available as a medium of exchange.
I think the case will be the same for Bitcoin. The utility of the exchanges made possible by Bitcoin will far exceed the cost of electricity used. Therefore, not having Bitcoin would be the net waste.