According to this article one of the unintended consequences of decades of red-lining in San Diego (and probably all other major US cities) is a tree equity problem.

 https://www.sandiegouniontribune.com/news/environment/story/2021-06-27/san-diego-tree-equity

Rich neighborhoods have many trees and poor ones not so much.  If we want to heal this earth we need to start planting trees. Lots of trees.