At the very beginning of our human experience, trees were considered sacred and honorable: Oaks were worshiped by the European druids, redwoods were a part of American Indian ritual, and baobabs were a part of African tribal life. Ancient Greeks, Romans, and scholars during the Middle Ages venerated trees in their literature. Dryads and tree nymphs (tree spirits) were important characters in many ancient Greek myths.

In more modern times, naturalist John Muir and President Theodore Roosevelt valued the wilderness, including trees, for its own sake, as they established the modern conservation movement and the National Park System and National Park Service. The modern human community values forests for their calming influence, as evidenced by the Japanese-influenced practice of "forest bathing" or "forest therapy." And people today have other, very practical reasons to admire and honor trees.