[Unedited] Andrew Revkin with Krista Tippett

[Unedited] Andrew Revkin with Krista TippettAndrew Revkin is Senior Fellow for Environmental Understanding at Pace University. His blog at The New York Times is called Dot Earth. This interview is edited and produced with music and other features in the On Being episode "Ursula King, Andrew Revkin, and David Sloan Wilson — Teilhard de Chardin's "Planetary Mind" and Our Spiritual Evolution." Find more at onbeing.org.