With ˜The Last Polar Bear," The Mountaineers Books has launched its new publishing venture, Braided River, with “The Last Polar Bear: Facing the Truth of a Warming World.”

The book contains nearly 200 color images by Steven Kazlowski, who has been following the creatures for the past eight years. Essays by conservationists, scientists and Alaskan natives supplement the photographs, including one by Theodore Roosevelt’s great-grandson. The Braided River imprint combines nature photography with...