Petrol price insurance

So in attempting to take some time off after the 2020 Summit, I forgot to write about my one big idea that came to me during the Summit but, of course, was never aired as I was in the wrong group for it. It was this: the way to sell the public on high petrol prices as a way of reducing emissions would not be to impose a tax on it but to fix the price of petrol at, say, $2.50 per litre, for the next 3 years and raise it by some fixed amount thereafter. What is the rationale? Well, we know that