Explore the cosmic evolution of all things including symbiogenesis, the geopolitical state, the Gaia hypothesis, and more, featuring astrobiologist David Grinspoon, comic co-host Chuck Nice, and biologist and author Tyler Volk. NOTE: StarTalk All-Access subscribers can watch or listen to this entire episode commercial-free here: https://www.startalkradio.net/all-access/cosmic-evolution-with-david-grinspoon/ Image Credit: NASA Goddard Space Flight Center Image by Reto Stöckli (land surface, shallow water, clouds). Enhancements by Robert Simmon. Don’t miss an episode of StarTalk All-Stars. Subscribe on: Apple Podcasts: https://itun.es/us/P9kphb.c Stitcher: http://www.stitcher.com/podcast/startalk-allstars TuneIn: tunein.com/startalkallstars SoundCloud: https://soundcloud.com/startalk_all-stars Google Play Music: https://play.google.com/music/listen#/ps/I2nz5bguurd5se7zu4fhnd25lk4 See omnystudio.com/listener for privacy information.