Car dependency and bad city planning.
This is literally the majority of the problem.
If you have a walkable town, you don't need a car for your basic you need to live. You just walk to the store. Also, because going to a store is not a car trip, you can do it every day, or every other day. You don't need a insanely large fridge and freezers that Americans seem to have. You can also take advantage of temporary price reductions.
Towns built around walkability, bikes and public transport are just superior in every way that we can measure, from health to water use and so on.
The US needs to fundamentally change its approach to cities and towns. You can't have poor people working in cities to provide services and then force them to live in some Cul-de-Sac cheap house 1-2h drive outside of the city.
I highly suggest people listen to Peter Calthorpe, who coined the turn Transit Oriented Development. Here some great videos that are worth checking out, one general, one about California:
- General/China: https://www.youtube.com/watch?v=KqldZhxl86I
- Cali: https://www.youtube.com/watch?v=fUtdFbK4YG4
This article is missing the forest while talking about trees.