I’ll do you one better
Replace most city car infrastructure by bicycle infrastructure. The few remaining required car parks? Move those underground under buildings and parks. Then those places that used to be car parks, make those actual parks to walk and sometimes cycle in
Then move solar on top of building roofs







And open the door to thousands different atrocities committed by thousands of different people
I feel you’re very optimistic if you think that single key people made all the difference in the world and that without them, no other key people would have stepped up