A study of tree cover in and around the California residences of 7,910 participants suggests that increased tree cover in a neighborhood is related to better overall health, particularly lower rates of obesity and improved social cohesion, even when considered independently from green space access.
Ulmer, Jared M, Kathleen L. Wolf, Desiree R. Backman, Raymond L. Tretheway, Cynthia JA Blain, Jarlath PM O’Neil-Dunne, and Lawrence D. Frank. (November 2016). Multiple health benefits of urban tree canopy: The mounting evidence for a green prescription. Health & Place 42: 54-62. https://doi.org/10.1016/j.healthplace.2016.08.011