I can agree that power usage for bitcoin network will be higher, but that's because there will be more transaction. Furthermore, the power usage will be more efficient since technology will keep improving over time
So i think there's nothing to be feared.
Nothing to do with the number of transactions.
Power consumption will always depend on the daily miners revenue (reard plus fee) / price of kw.
The blockage miners will never consume more power than they could buy with the mining revenue.
Many miners occur next to hydroelectric power plants with reserves, and many are power generators for other reserves. Even later diesel will be cheap and will expand worldwide.
Would that be a problem to all of you ?
Oh , you just solved one of the world problem.
If miners use electricity produced by the dams, don't you thing that they are using somebody else share?
If we all could use hydro power and pay .1 cents for one kw a lot of this world problems would be already solved.
The power needed to run Bitcoin, does not compare to the total amount needed to run the Fiat banking system. You have to think of all the
appliances in and around a bank that are necessary to run it, for example : Air conditioning / ATM's / computers / CCTV systems / Vaults and
all the lights in these buildings... and we have not even started on the amount of electricity that are needed to manufacture coins and to print
money.
I'm pretty sure that localbitcoins, xapo, blockchain.info are not using even one watt of electricity.
Or the 3000 bitcoin atms.
Or the computers that are powered up when you make a payment.