The book is a great read for textbook about philosophical questions of ethics on environment. It goes through several division and subdivisions of philosophy. Normative, virtue ethics, Kantianism, Singer's perspectives, and Regan's perspectives on animal rights and equality based on moral agents and patients. It goes well with currently updated carbon dioxide that affects the atmosphere and temperature rise on global scale. This book concentrates on the ethical dilemma like should kill cows and pigs for food? Is that an ethical issue? If it is, are we right? What if we become invaded by powerful foe who sees human beings as food resource? Is same perspective applicable for the invaders? Are they in the right?