Environmental Science, Ninth Edition, is a comprehensive presentation of environmental science for non-science majors which emphasizes critical thinking, environmental responsibility, and global awareness. This book is intended for use in a one- or two-semester course in environmental science, human ecology, or environmental studies at the undergraduate level. The goal of this book is to provide an up-to-date, introductory global view of essential themes in environmental science along with emphasis on details and case studies that will help students process and retain the general principles. The authors make the text readable and accessible without technical jargon or a presumption of prior science background. At the same time, enough data and depth are presented to make this book suitable for many upper-division classes and a valuable resource for students who will keep it in their personal libraries after their formal studies are completed.Introductory environmental science that presents all sides in the issues. This text emphasizes critical thinking by asking the reader to view all sides of an issue and to make informed, rational decisions based on ethical values. New and updated content throughout ensures that the most recent data in environmental science are included. Expanded coverage of evolution, found in Chapter 4. New Instructor Media! Upon adoption of the text, instructors will have access to over 200 engaging video clips to integrate into their lectures for more visually stimulating presentations. * New Discovery Channel Education Video Clips on DVD cover topics ranging from ecology, evolution, chemistry, and energy, among several others. These short, 5-minute video clips include an easy-to-use search function for quick access. Critical thinking emphasis. Throughout the text, the skill of critical thinking is emphasized by asking the reader to view all sides of an issue and to make informed, rational decisions based on ethical values. * Case Studies, "Exploring Science" boxes, "What Do You Think?" essays (many with "Ethical Considerations" attached), and "Think About It" boxes give students real-life examples to evaluate and a chance to practice critical thinking skills and formulate reasoned opinions. These boxes are carefully planned to build upon chapter content and are long enough to present important, real information. * End-of-chapter "Questions for Critical Thinking" are designed to stimulate creative, analytical thinking and to serve as a springboard for class discussions.