In the last three decades of the 20th-century, bioethics has matured into a field of study with several areas of concentration, including medical ethics, environmental ethics and more recently, genetic ethics. For reasons related to both the developmental history of the subject and to the poignancy of the problems presented, most textbooks and collections of essays have dealt with only a single area, medical ethics. In fact, to many not in the field, the word bioethics has become synonymous with medical ethics. The aim of this collection of essays, is to enlarge this restrictive vision of the field as it is usually studied at universities. By combining essays relevant to medical ethics with companion essays on environmental ethics and genetic ethics, the book emphasizes similarities in the methods of analysis used in diverse bioethical problems, whether dealing with genes, with people or the environment. In this way, it hopes to contribute to the intellectual unity of the subject and to suggest changes in the way bioethics can be taught and studied at both the graduate and undergraduate level.