In particular less cars means paths that are more suitable to walking in all weather - having a treed foot path instead of a boulevard outside your house makes

In particular less cars means paths that are more suitable to walking in all weather - having a treed foot path instead of a boulevard outside your house makes a big difference in heat exposure to pedestrians and buildings. If you look at old Iberian (especially Portugal) you'll see very aggressive tree placement coupled with narrow alleys to try and keep paths walkable when things get really hot. It's night and day comparing the tight shady paths in Porto to the sun blasted avenues common in Florida - while the temperatures are pretty close the experience is entirely different.