Keep in mind that ostensibly, our Habitats move about space when necessary by harnessing the power of the atom, and that the "cars" that we use here are "electric" in their operation.
Most of our functions out here in the asteroid belt are set up to work automatically. The mirrors which reflect and enhance sunlight out here are basically a clockwork mechanism. The energy for our food comes from the even more distant sun.
Much of the force behind moving air about comes from differential heating following that daily energy infusion. In theory, if all of our high-grade technology fell into disrepair, our populations should still be able to eke out their survival with the basic setup.
How else would our descendants still be here thousands of years from now when ... oh wait, I haven't finished that story yet.
I’m still waiting for the car of the future to be like the one driven by George Jetson.
Not sure what kind of energy that car ran on.
Thankfully, no grey goo scenarios.
Though I’m certain a few nanites escaped the lab here and there.
Possibly with the Ships cat.
Don't worry. We all know the ending. "...when the Dark Lord, Obama, destroyes civilization."