With its unique modular organization and striking four-color art program, Elements of Ecology provides a clear introduction to ecology. Far reaching in its coverage, the Fourth Edition Update not only presents the principles of ecology but shows their relationship to today's most pressing environmental issues in a way that is meaningful to students. NewEcological Application essays synthesize concepts to illustrate their relevance to real-life problems. Chapter 26, Global Environmental Change has been revised to incorporate new research from this rapidly changing field. New Elements of Ecology Companion Website includes student and instructor resources geared specifically to the text.