New York Times columnist Thomas Friedman says that stopping climate change will be humankind's biggest undertaking. Hosted by the Aspen Institute, the 2007 Aspen Ideas Festival, http://www.aifestival.org, offers its participants a variety of prog Hosted by the Aspen Institute, the 2007 Aspen Ideas Festival, http://www.aifestival.org, offers its participants a variety of programs, tutorials, seminars, and discussion events that together charged the town of Aspen with vibrant intellectual exchange. Some of the most inspired and provocative thinkers, writers, artists, business people, teachers and other leaders drawn from myriad fields and from across the country and around the world all gathered in a single place—to teach, speak, lead, question, and answer.