Julia Butterfly Hill is known for climbing a 1,000 year-old redwood tree in 1997 when she was 23 years old, and remaining there without touching the ground for two years, as part of a successful effort to call worldwide attention to the destruction of California's ancient redwoods. Since then, she has addressed the U.N., lobbied Congress, and continued to stand on the front lines of environmental and social justice issues all over the world. She is the author of The Legacy of Luna: The Story of a Tree, a Woman and the Struggle to Save the Redwoods and One Makes the Difference: Inspiring Actions That Change Our World.