Ozone: Keep It Up Where It Belongs
Guest: Paul Newman, Chief Scientist for Earth Sciences at NASA 
A couple decades ago, we were all obsessed with the ozone layer. Today we speak with NASA scientist Paul Newman about how it became threatened and the road to atmospheric recovery.

Up In Flames
Guest: Ben Abbott, Professor of Plant and Wildlife Sciences at Brigham Young University
Every year there seem to be more wildfires than the year before. That isn’t your imagination—Ben Abbott explains the increasing rates of wildfires around the world. We also talk megafires, a new breed of wildfire that we don’t yet totally understand. We're managing forests better, but we now have to deal with the side effects of climate change.