Humanity's well being and ultimate survival are inextricably bound up with the health of the natural world. We often take for granted that nature will continue to provide the basics of life--food to eat, water to drink, fuel for warmth, air to breathe. But today the world's natural resources are threatened daily. Forests are leveled, grasslands overgrazed until they turn to desert, oceans and streams polluted. In Nature in Danger, conservation expert...