Book excerpt: Water is our most vital resource, yet few understand even the basics of watershed ecology. This new edition has been updated to reflect growing environmental challenges, such as climate change, the insidious spread of invasive species and the loss of biodiversity. Watersheds: A Practical Handbook for Healthy Water is an engaging and informative introduction to ecology and environmental issues that focus on water-related issues. Well suited for youth or general readers of any age, Watersheds combines a profusion of beautiful illustrations with non-technical and accessible text, making it attractive as well as informative. The book explains ecological principles, environmental challenges, introduces North America's major biological regions, outlines the complexities of water and nutrient cycles and explains the ecology of wetlands and waterways. Watersheds also explains some of the major environmental issues facing North America, including air pollution, water pollution, invasive exotic species, and habitat loss and destruction. Watersheds provides detailed information on: water and nutrient cycles bioregions and aquatic habitats exotic species invasions water and air pollution ecological restoration habitat loss. While Watersheds identifies and explains multiple ecological challenges, the book is engaging, empowering, and positive, providing practical "How Can I Help?" sections aimed to inspire participation in efforts to restore watersheds and protect the environment. As the book explains, what's good for one's local watershed is also good for the planet -- so we can all help protect and restore our natural environment.