What needs to be done is relatively simple. Convincing society to fix what's broken is the hard part.
We need to restructure cities away from being driving focused.
A lot of Americans genuinely like their cars and low-density single family neighborhoods.
This would also be a massive and expensive undertaking that would require rebuilding the majority of city infrastructure.
It would be cheaper than continuing down the current path. Like I said, the answer is obvious and conceptually simple. Getting people to accept the truth is the hard part.
It took us centuries to screw everything so I don’t claim any of this is simple. But we will need to start actually fixing stuff eventually, rather than adding patches.