Imho the real problem that will be harder to reverse on is the city planning. Car-oriented cities will be intrinsically far more difficult to green than urban density.
Late 20th and early 21st century city planners will be remembered as an entire profession of Thomas Midgley Juniors.
Agreed, cities oriented around the car can't be saved. The cost of maintaining 12, 16 lane highways is so exorbitant that they'll have to maintain the sprawl ponzi scheme or go bankrupt.
Late 20th and early 21st century city planners will be remembered as an entire profession of Thomas Midgley Juniors.