2025-03-19 00:00:00 Tell us about your tree and we'll estimate the carbon dioxide and air pollution it removes plus stormwater impacts. It's quick and easy! Since 2006, i-Tree has been a cooperative, public/private partnership between the USDA Forest Service, Davey Tree Expert Company, The Arbor Day Foundation, Society of Municipal Arborists, International Society of Arboriculture, Casey Trees, and SUNY College of Environmental Science and Forestry.