Tree cover may improve academic performance. A study of 624 Illinois public high schools showed that tree cover density within a 1-mile radius of schools was positively associated with better ACT scores and college readiness, even when controlling for other factors known to influence academic performance.
Li, Dongying, Yen-Cheng Chiang, Huiyan Sang, and William C. Sullivan. “Beyond the School Grounds: Links between Density of Tree Cover in School Surroundings and High School Academic Performance.” Urban Forestry & Urban Greening 38 (2019): 42–53. https://doi.org/10.1016/j.ufug.2018.11.001