Mountaineers Books has published “Yellowstone to Yukon: Freedom to Roam,” with more than 200 full-color images by Florian Schulz (see Portfolio, page 12) and a foreword by Robert Kennedy Jr. Schulz documents the landscape, plants, animals and people of an ecosystem that exists along the spine of the Rocky Mountains. Although the wildness is still untouched by man, it lies in the path of encroaching development.

Contributing essayists Karsten Heuer, David Suzuki, Rick Bass and David Quammen describe their travels through the region. They explain the principles of the Yellowstone to Yukon (Y2Y) conservation initiative, based on findings that isolated nature sanctuaries are a recipe for extinction. The program, grounded in science, is designed as a practical plan that provides for economic as well as environmental sustainability. The 192-page hardcover edition sells for $34.95.