This book investigates the profound cultural and ecological impact of the American West on its indigenous populations and natural landscapes. Drawing on historical accounts, anthropological research, and personal observations, Nichols presents a narrative that explores the interconnectedness of human societies and the environment, arguing for a deeper understanding of the forces that shape both.

John Nichols' "If Mountains Die" is recognized for its evocative prose and its deep engagement with the American West. Critics have noted its blend of personal reflection and historical analysis, offering a nuanced perspective on the region's cultural and environmental transformations. The book is often cited for its sensitive portrayal of Native American life and its urgent call for ecological awareness.