Six million is peanuts, really.
I also don't understand where people get the idea that outlawing internal combustion engines is what's proposed. That's just a lie. And a big one that gets repeated time and time again. Always by the same people who apparently need a mantra to cling to.
Because it is happening. California is the highest population state in the USA (over 10% of the total) and has huge influence in DC. VP and several cabinet members are from CA. It's clear that current CA governor Gavin Newsom is being prepared to take over POTUS.
Here's what's happening there:
https://www.newsweek.com/list-equipment-affected-gavin-newsom-ban-small-engines-california-1640341
If electric versions of these devices were actually better or viable alternatives then they' be in use by now. In some cases they are (homeowners with small lots, etc.). But in most cases they are not, so gov do-gooders are forcing the issue to the detriment of thousands of small businesses and the public safety of millions of residents in power outages (in the case of backup generators).
And, yes, ICE cars are on the block by 2035 while diesel engines have already been severely restricted despite their being more efficient and long-lived (amortizing the sunk cost of their initial manufacturing over a longer lifetime) for trucking and other uses.
https://www.businessfleet.com/159374/new-calif-diesel-regulations-got-compliance
These engines all have complex DEF systems and have been a safety issue for operators/drivers. DEF is yet another chemical concoction that must be manufactured, transported, and purchased nationwide.
https://www.npr.org/2023/03/31/1167561417/california-diesel-truck-phase-out-plan-epa
This is laughable because there is no EV alternative that can haul the same loads with the same range that diesel trucks do every day.
What we want, is clean exhaust. Hydrogen as a solution has the benefit that it can be "burnt" cleanly in a classic engine and in a fuel cell.
Hydrogen has major problems with generation and distribution due to its density. Thousands of psi is a real challenge. This also limits the available volume of fuel tank as well as its shape. Currently available fueling systems are clunky at best and freeze in humid environments.
Oldfashioned tech, like engines has reached the peak of it's performance. It will still be around for years to come.
Efficiency and performance gains are still being made, but there is an upper limit unless waste heat can be converted to something usable.
The next problem we need to tackle, isn't the propulsion. We already have the tech for propulsion with clean exhaust. It's the rest of the hazardous materials: brake- and tire dust. That'll be a harder nut to crack.
Fourth order problems that aren't in the mix. Asbestos isn't used for brake pads AFAIK. Certainly not in the US. What are you wanting to mandate next, EV hovercars?
And then we need to look at asphalt and how we can replace it with something that's not so unhealthy.
Concrete. Except silicosis is real and concrete has high extraction and manufacturing costs and energy requirements. But your magical EV hovercraft solves that!
Bottom line: the left has no pragmatism.