Our world is far richer than previously conceived, yet so ravaged by human activity that half its species could be gone by the end of the present century. These two contrasting truths–unexpected magnificence and underestimated peril–have become compellingly clear during the past two decades of research on biological diversity.In this timely and important new book, Wilson describes exactly what treasures of the natural world we are about to lose forever and what we can do right now to save them. Destruction of natural habitats, the rampant spread of invasive species, pollution, uncontrolled population growth, and over-harvesting are the main threats to our natural world. Wilson explains how each of these elements works to undo the web of life that supports us, and why it is in our best interest to stop it. In the process, he explores the ethical and religious base of the conservation movement and deflates the myth that environmental policy is antithetical to economic growth by illustrating how new methods of conservation can ensure long-term economic well-being.