Peter Roff, U.S. News & World Report & Medea Benjamin, Global Exchange / CodePink / Drone Warfare: Killing By Remote Control & Kevin Martin, Project 21 join Thom. On Thursday - the Vatican finally released Pope Francis's groundbreaking encyclical on climate change. Titled "Laudato Si" - it calls on world leaders to take immediate action to cut carbon pollution and begin the full transition to renewable energy. The encyclical also calls global warming an outgrowth of capitalism - and says that since rich nations have done the most to cause climate change - they should do the most to stop it.