Spoiler alert: The civilization disrupting aspects of climate change are still decades out and the rich countries will probably be fine.
They'll be fine because they can afford the infrastructure projects and increased costs of energy and food.
Now Africa, South America, the poorer Asian countries, tiny Pacific Island nations... Oh boy. I would not want to be a citizen there in 20 or 30 years.
Eventually sea level rise will become a really big fucking problem, like for every single coastal city in the world, even the rich ones. Luckily none of us will be around to see that unless some sort of miraculous life extension technology becomes available.
On the one hand I don't like mentioning this because it gives the right wing ammunition to ignore climate change. But on the other hand some people have such existential dread about it that it's damaging their mental health, they are really overestimating how damaging it will be in their lifetime in their rich country they live in.
The suburbs are inherently compatible with trains and really any public transportation. They were quite literally designed around the car and the expectation that everyone would have a car.
Unless you plan to bulldoze the suburbs and then force everyone to move into higher density areas your anti-car dreams are never going to happen.
Although there are many American cities that could get much more anti-car and public transport would work. LA could theoretically not be such a car city with the appropriate infrastructure built in.
Why are the anti-car people anti-self-driving car? With self-driving cars we could mostly eliminate private car ownership.