On December 18, 1999, Julia Butterfly Hill's feet touched the ground for the first time in over two years, as she descended from "Luna," a thousandyear-old redwood in Humboldt County, California.

Hill had climbed 180 feet up into the tree high on a mountain on December 10, 1997, for what she thought would be a two- to three-week-long "tree-sit." The action was intended to stop Pacific Lumber, a division of the Maxxam Corporation, from the environmentally destructive process of clear-cutting the ancient redwood and the trees around it. The area immediately next to Luna had already...