Lierre Keith is a long time activist, and the author or co--author of seven books, most notably Deep Green Resistance; and The Vegetarian Myth. She and I discuss how and why agriculture is inherently destructive, and is, as Jared Diamond noted, the worst mistake humans have ever made.

Mike Mease is the co-founder and campaign coordinator for the Buffalo Field 
Campaign.  He has spent the last 16 years living with and helping protect 
this sacred species the Buffalo in the Yellowstone ecosystem.

Carolyn Baker. She is the author of Collapsing Consciously: Transformative Truths For Turbulent Times. Her previous books are and Navigating The Coming Chaos: A Handbook For Inner Transition (2011) and Sacred Demise: Walking The Spiritual Path Of Industrial Civilizations Collapse (2009). She lives and writes in Boulder, Colorado.

John Osborn is an MD who has dedicated his life to doing what is right, 
whether it is through his medical work, or through his environmental 
advocacy. He has worked to protect salmon, forests, bull trout, and so many 
others. He has worked with the various indigenous peoples in his region 
helping them to protect their land. He has worked on health issues 
internationally. And most recently he has begun working on suicide 
prevention among the young.