[cmews]

I agree with you, however historically the move from leaded fuel to lead-free fuel proved that we could do it or the protection of the ozon layer (one of the few times in history that we took collectively action against something damaging humanity, but it doesn't happen often enough). Curious what would cause a tipping point for improving air quality or any of the other multiple crises you mentioned and if we could learn something from history.

[AstralStorm]

The only worked because we had a ready replacement in place. (Different comparable gasoline additives, different comparable refrigerants, alternative motive gasses for pressured containers.)

And even today, leaded gas is still used for aircraft.

The problem with fossil fuels is we really do not quite have anything as energy dense and useful, not even lithium. (Which there is too little of, not to mention mining issues.)

As such, it will require a major change not just a tweak.