Will we return to horse and carriages?
Today- we can use batteries and solar power to provide air-con and heating.
Carriages are light, simple and the possibilities for design and innovation are endless
Horses are fairly efficient, you can stick a large variety of "fuels" into them and they last at least 10 years+.
Average current city traffic speedds are below 25 mph in many cities.
Horses' emissions whilst loud and rather obnoxious if close by (never stand behind a horse in a stable stall)- the methane could be easily burnt off with a mini-pilot light near its' butt. Free and highly amusing ikntermittent illumination. Like nitro funny-cars.
Horse poop is easily avoided lkittering streets via horse-butt-pooper-bag (forgotten correct name)- which can then be used for fertiliser, paper, methane production...
Horse and carriages can all be sourced locally, a huge dormant, sustainable industry could re-emerge- even auto-makers could be carriage-makers