The quiet nature of trees hides the fact that trees are always working for us. Their biggest, most important job is playing a role in making Earth and our environment healthy. Learn some of the ways trees help, why they are in danger, and what you can do to help protect them. Includes step-by-step ideas for taking action, different points of view, an up-close look at relevant careers, and more.

Chapter One. Trees Help the Environment -- ch. Two Problems Trees Face -- ch. Three People Help Trees.