Earth has warmed and cooled before. So what’s different now?

The temperature range that can sustain human life on Earth is incredibly narrow. Michael Mann is Presidential Distinguished Professor and Director of the Center for Science, Sustainability and the Media at the University of Pennsylvania. He joins host Krys Boyd to discuss the precarity of human evolution and how previous changes in temperatures have affected life on the planet. His book is “Our Fragile Moment: How Lessons from Earth’s Past Can Help Us Survive the Climate Crisis.”