Oil ain't a picnic either, so what's the answer?
I agree US is too big to be covered by public transit, but if we want to win the climate war, US has to cover all its states and make public transit seamless. Once this goal is complete, discourage owning of personal vehicle.
Also a picture comparing car vs bus [1]. Now compare the green house emission between two.
[1] https://www.boredpanda.com/space-required-to-transport-60-pe...