WE INSPIRE PEOPLE TO PLANT, NURTURE, AND CELEBRATE TREES. The Arbor Day Foundation is a 501(c)(3) nonprofit conservation and education organization. A million members, donors, and partners support our programs to make our world greener and healthier. We plant trees because people need trees. Our health and the health of our planet are interconnected, and the simple act of planting trees benefits both. The Arbor Day Foundation works to connect opportunities, people, and organizations to plant trees and forests to help solve some of the most critical issues facing our planet.