I don't quite follow. You're suggesting more trees in cities/towns?
Probably more interestingly, I am skeptical about the premise. Obviously, cities need parks and trees. Largely they have parks and trees.
I see a lot of newer areas designed with mini-lawns and I always shake my head - in an urban environment, the name of the game is density and accessibility. Don't put a bush between the sidewalk and your shop: the shops are supposed to be on the sidewalk. Half of the time, these shops seem to be hiding their main entrance in the back, next to a parking lot, because it's actually a suburb with some apartments over a dentist office, not a real attempt at an urban environment.
Visible on google maps here https://www.google.com.au/maps/@-34.9279778,138.6043731,3461...