> Let's take Americans, for example, driving their cars to work.
This is easily solved by switching to EVs. A small-size EV (perfect for personal transportation) is only slightly less CO2-efficient than rail ( https://ourworldindata.org/travel-carbon-footprint ).
I wish the world would ditch public transit entirely. It's nothing but a misery generator. It's far better to switch to remote work and distributed cities.