Julia Butterfly Hill is a famously eloquent environmental activist, who, from December 1997 to December 1999, lived atop a 1500-year-old California Redwood tree on a tiny, handbuilt platform. She spent 738 days more than 180 feet off the ground on one of the most successful tree sits in Earth First!'s history of organized action.You can watch the entire 2000 documentary about Julia Butterfly's tree sit until September 30 over at PBS.