Jon Waterman is a former park ranger, wilderness guide, and a prolific author of books on adventure, exploration, and the environment. In this episode of Nature Revisited, Jon recounts his decades-long history of explorations of the Alaskan Arctic. Having returned to the Noatak headwaters after 30 years in 2021, Waterman was shocked by the environmental and cultural changes wrought by the climate crisis. As in his book Into the Thaw, Waterman paints for our listeners an intimate portrait of both the villages and the little-visited landscape, suggesting actions we can all take to slow the thaw and preserve what is left of the remarkable, vast Arctic frontier.