The Habitable Planet: A Systems Approach to Environmental Science is a course for high school teachers and undergraduate students in environmental science. The content course will help teachers of biology, chemistry, and Earth science to provide more content in their classes. The course components include 13 half-hour video programs, a coordinated Web site which includes the streamed video programs, the course text online, five interactive simulations, background on the scientists who created the content and those whose research is documented, a professional development guide (also available in print form), and additional resources. Graduate credit is available for the course through Colorado State University. nThis course begins with an overview of the Earth's systems