I’m just quoting that part as a launching point. I’m not an economist, and I’ll take the semantics as an educational moment but hope we’re having more of a conversation than a dissertation. Frankly, I kind of saw the OP as a bit of a lead-in to a car-free scifi dystopia anyway, a fun bit of bar-room banter with perhaps the chance for some back-of-the-napkin math.
In a projection brawl against the New Yorker, I’ll come up on the short end of that stick, sure. I was able only to read the text (the article is effectively paywalled) but the article IS US-centric. And, without intending offense, the US collectively lags behind the world average in concern for the environment, and has less alternatives for personal transport than other G8 nations.
While it does represent a significant market share, it’s not the majority of the world market. The New Yorker article, based on my somewhat-hampered reading, does not seem to take global trends into account in its projections.
If you were to say, “US trends for vehicles suggest 40-60% IC engines by 2050,” I would not argue with you. Globally? I think I would.
But all that aside, let’s just roll with that 40% factor world-wide, because why not? What’s the other 60%?
Some of that is electric, likely battery-powered electric. Factors to consider are whether the province of Alberta can start lithium processing (since it’s suggested they have large deposits) and whether some of the projected battery advancements do take place. I’m bullish on batteries, but I’m not excited by them.
I imagine there will be a lot of stopgap measures, like propane or LNG. It’s perfectly feasible to convert a gasoline engine to run on either of those fuels, and while they’re still dumping carbon, LNG could theoretically be carbon-neutral if you made it from biowaste. Who knows?
What’s that leave? Hydrogen is something I’m personally enthused by but I know it’s kind of a joke because it’s so impractical on every level. Kinetic energy storage (read: flywheels) are just a “casual, haha” issue of sorting out the material science behind making a flywheel that can store enough energy without self-grenading, and that’s proven to be an utterly non-trivial problem.
So I’d probably go with “batteries, and more batteries,” followed by LNG, as to what would replace most engines.
The last point I had, now that I remember: I think it’s kind of a leap on the article’s part to go from, “The average age of a vehicle is 12 years,” to, “Most vehicles will survive 20 years or more.” But that’s an entirely subjective feeling without math behind it, so you may as well call it handwaving.