The Trust for Public Land
National nonprofit organization working to protect land for human enjoyment and well-being. TPL helps conserve land for recreation and spiritual nourishment and to improve the health and quality of life of American communities.

Human Environment Research Laboratory (HERL)
Established the relationship between people and the physical environment relationship between people and the physical environment.

How To Plant A Tree (American Forests.org)
Learn how to plant a tree in your backyard with these step-by-step rules for tree planting.

Trees Are Terrific (Travels of Pierre)
From the University of Illinois Extension. Flash program for teachers and students (includes Teachers Guide).

Exploring the Secret Life of Trees
From the University of Illinois Extension. Flash program for teachers and students (includes Teachers Guide).

A Walk In The Woods
From the University of Illinois Extension. Flash program for teachers and students (includes Teachers Guide, Nature Notes, and more).