Which will help the environment by reducing the machines production
On the contrary. Even if your scheme worked, and you could force miners to sit idle 80% of the time,
that means they'll reinvest the saved electricity costs into buying MUCH MORE hardware to stay competitive.
As long as Bitcoin issues $50M dollar's worth every day, we can expect miners to collectively spend nearly that much money in competing for it.
All you achieve is a shift from electricity costs to hardware costs.
Good point. High prices will drive competition crazy and we can expect miners to do whatever needed to make more money.