Book excerpt: As climate change encroaches, natural habitats are shifting while human development makes islands of even the largest nature reserves, stranding the biodiversity within them. The Spine of the Continent profiles the most ambitious conservation effort ever made: to create linked protected areas from the Yukon to Mexico. Backed by blue-ribbon scientific foundations, the Spine is a grassroots, cooperative effort among NGOs large and small and everyday citizens. It aims not only to make physical connections so nature will persist but also to make connections between people and the land. In this fascinating and important account, Mary Ellen Hannibal travels the length of the Spine and shares stories of the impassioned activists she meets and the critters they love.