Material phase changes are like a cheat code for humanity. Reusable chemical handwarmers are also black magic. You just click a metal plate inside and all of a sudden it's a hot solid.
NightHawkInLight made a video showing how you can mix two different salts together and it'll create a packet that stays at 65 degrees for hours.
I view it as sidelining cars to improve public transportation.
That's what I've got. It takes decades to break down this infrastructure for new stuff. You also need the to be having accessibility in mind whenever you are thinking about installing public amenities or removing infrastructure.