We know the elements of erosion: wind, water, and time. They have shaped the spectacular physical landscape of our nation. In her new book “Erosion: Essays of Undoing” Terry Tempest Williams explores the many forms of erosion we face: of democracy, science, compassion, and trust. She asks: "How do we find the strength to not look away from all that is breaking our hearts?" And she says what has been weathered, worn, and whittled away is as powerful as what remains.