But in reality there are forest's everywhere, all around you. Some Rural Some Urban
Urban forests are important because:
Here in SF we implemented Urban Forest Plan / Street Trees This helps combat X Y Z problems
A major Component to saving trees in SF might suprise you. If a trees roots causes the sidewalk to be lifted it creates a tripping hazard. Often times that means the tree will be removed and the sidewalk replaced.
If we can fix the sidewalk with out replacing it, we can save the tree. Not only that its cheaper too.