On December 10, 1997, a young woman climbed 180 feet to a 4-by-6-foot platform in an ancient redwood tree. Julia Hill was participating in a sit-in, a strategy adopted by environmentalists to bring attention to the destruction of the old growth forests that clean our air, nurture our soil, support the diversity of life, and inspire awe in humankind. At the time of Julia Hill’s climb, only 3 percent of our country’s ancient redwood ecosystem survived. Luna, a 1,000-year-old Western Redwood...