Trees are both amazing and vital. Their intricate, complex processes benefit humanity in so many ways, especially in cities, where populations are on the rise. Why Trees? is a non-fiction book about how to keep our urban trees healthy. It is an engaging, pleasurable read, packed with information about these endangered climate champions. Trees are beacons of hope for our future. We must reframe how we view these magnifient structures so they are given a higher priority. A short collection of captivating articles takes the reader on a journey through the many wonders and benefits of living with trees in an urban environment. The author highlights the fundamental needs that must be met for young trees to grow a healthy root system. With that strong foundation, they can thrive, live their full lifespan, and provide us with a healthy urban canopy and ecosystem. Readers will be informed, educated, and motivated to recognize and share the wonder and importance of trees and their role in the future.