This already happened long ago by artificial selection and hybridization. One example that is found all over the world in Urban areas is the highly pollution re

This already happened long ago by artificial selection and hybridization. One example that is found all over the world in Urban areas is the highly pollution resistant London Planetree: https://arbordayblog.org/treeoftheweek/london-planetree-tough-dweller-confusing-past/ https://arbordayblog.org/treeoftheweek/london-planetree-toug... Only problem is that at least in my area, they constantly shed leaves, all season long.