GLP-1 pharma intervention is breadboarding the human, next step is a permanent fix. Adversarial bioengineering, if you will.
Regarding your proposed gene therapy, would this gene therapy be available to anyone? Could it be refused? Is it reversible? Who would pay for it? The beauty of The Culture is that it is not monolithic, has no border, has godlike AI that takes care of all the problems, and can be abandoned or joined by anyone.
I know what you meant, but according to a comment here once, European city streets actually have worse air pollution than US ones because Europe went hard for diesel engines (to reduce CO2 emissions) for its cars, and diesel produces a lot of very small carbon particles, which turned out to be more harmful than most people suspected back when the diesel decision was made.
[1]: https://www.amsterdam.nl/en/traffic-transport/low-emission-z...
Of course, Volkswagen lying about their diesels and killing people in the aggregate didn’t help.
What we need is car-free or low-car cities, not just different cars.
Popular EV's aren't significantly heavier than ICE vehicles. A Tesla model 3 and a BMW model 3 are both about 3500 pounds. Range is a huge selling feature for EV's and weight has a significant impact on range, so there is strong evolutionary pressure to lighten EV's. Crappy EV's like the Hummer are heavy; but popular EV's like Tesla's and Hyundai's have weight comparable to normal cars so that they can have impressive ranges without too many expensive and heavy batteries.
EV's increased tire wire is due to their massive torque at low range. If you want your tires to last, just don't drive like a hooligan. We got 70,000 km out of our first set of EV tires.
Tire particulates are an "all cars a bad" issue. EV's are not significantly worse than petrol vehicles vis a vis tire particulates. Their lack of exhaust particulates means that an EV produces about ~half the total number of particulates.
Even so, I still find that the fewer cars there are, the easier it is for me (and my kids) to walk and bike places safely, helping us be healthier (and not reliant on drugs like Ozempic) which was the real point of my comment.
Everyone is directly responsible for their own health and nobody else is. The insanity of this statement is baffling.
I lost a bunch of weight when I moved to Dublin and started walking everywhere. Then I moved to the Netherlands and lost even more, and got stronger. I didn't particularly try, I just lived somewhere where I used my own body to get around and the "normal" portion sizes were actually somewhat sane (a bag of Doritos here is maybe a third the size of one in the US).
I was 280 pounds when I lived in suburban California. I'm 180 pounds now.
Build bike lanes and public transport, put schools where kids can walk to them, and maybe don't sell a thousand calories of chips in a personal-sized and marketed bag, and it should get better.
As an added bonus you get a lot less air pollution (and noise pollution, etc.) and less people being run over!