In 2015, long-time wilderness ranger Todd Burritt spent two months walking across the Greater Yellowstone Ecosystem. His account represents a survey of the state of wildness in one of the world's premier natural areas. Despite visiting several of the most remote areas in the lower 48, Burritt never managed to escape the modern paradoxes invading our timeless landscapes; the most bedeviling of them all were those he carried in his own head. As much...