Photographer Tim Palmer presents hundreds of images of the U.S.'s rivers and discusses their protection and the life within them.

Rivers of North America, Second Edition features new updates on rivers included in the first edition, as well as brand new information on additional rivers. Thi

A new vision is sweeping through ecological science: The dense web of dependencies that makes up an ecosystem has gained an added dimension-the dimension of tim

From perpetually snow-capped peaks to stifling deserts below sea-level, the Colorado cuts the deepest and truest cross-section through the heart of the continen