To learn more about how research demonstrates the value of trees, see these sources:
Downloadable brochure to understand the value of trees (PDF)
“Trees Pay Us Back,” US Forest Service
“Benefits of Trees and Urban Forests: A Research List,” Alliance for Community Trees
i-Tree calculator, US Forest Service
“The Role of Our Urban Forest in the Chicago Metropolitan Region's Future," Chicago Metropolitan Agency for Planning
"Modeled PM2.5 Removal by Trees in Ten U.S. Cities and Associated Health Effects,” US Forest Service
Chicago Metropolitan Area Regional Tree Census, The Morton Arboretum and US Forest Service