How do environmental conditions impact our health and well-being? Dr. Mark Vossler is the 2025 national president of Physicians for Social Responsibility, as well as a congressional liason for Citizens' Climate Lobby. As a practicing cardiologist for over 30 years, he has seen first-hand the effects of climate change on our physical health. Dr. Vossler is a prominent advocate for public health and sound environmental policies at both the state and national levels.

Eric Larsen is a world-renowned polar explorer, mountaineer, and filmmaker who has been exploring the most remote regions of the planet for more than two decades. In one notable year, Larsen skied 751 miles to the South Pole, trekked 51 days to get to the North Pole, and then climbed Mount Everest. Nat talks with Eric Larsen about his inspiration for exploration, the complicated logistics of polar expeditions, and the effects of global warming on the polar ice caps.