Imagine how many people are now watching shows you abhor on Netflix - think of all the electricity we could save if they turned off their TVs.
I don't believe in the concept of a "humanity". There are humans.
Bitcoin has no incentive to do this, and no ceiling on consumption, since any efficiency gains just get plowed straight into increased mining, and so energy consumption can only ratchet up, forever. Address that claim, please.
If we just properly externalized the cost of CO2 emissions it solves this problem along with many others. So why don't we do that?
That redundancy is otherwise uneconomical to produce (if there isn't the demand).
When that redundancy is needed, that power can be redirected from the miners. Presumably the miners are expected to behave and switch off at such times, but there is no reason why that expectation can't be legislated.