This book illustrates how trees grow and function, looks at their astounding diversity and adaptations, documents the key role they play in ecosystems, and explores the multitude of uses to which we put trees - from timber and pharmaceuticals to shade and shelter. It delves into many specific topics: the details of flowers, bark, and roots; profiles of favourite trees; how animals and insects interact with trees; trees in urban landscapes; the role trees play in our changing climate; deforestation and reforestation; and much more.