Intended for environmental science, environmental biology and human ecology courses, this book is a comprehensive revision with an update of each chapter. It uses basic scientific concepts to show how global, national, and local environmental facts, problems, and possible solutions are related and discusses and evaluates opposing sides of major environmental issues and treatments. The text emphasizes energy as an integrating concept, presenting a sustainable-Earth world view and a realistically hopeful attitude. 10,000 references and 200 specialist reviewers document and support the text.