"For anyone interested in the future of humankind, this book can only be recommended." (Tim Meijers, Ethical Perspectives)
"Persson and Savulescu have explored with rigor and insight a crucial, but disquieting question: Are the moral capacities of human beings sufficient to deal with the threats to their survival created by modern scientific technology? There are many criticisms of biomedical moral enhancement in the scholarly literature media, but Persson and Savulescu argue forcefully that they are unfounded and that such enhancement might be necessary for the survival of human civilization. One can only hope that this fine book will be widely read." (Allen Buchanan, Duke University)
"I welcome this book's call for research into the full array of ways of making us morally better. The authors make a powerful case for saying that our current moral endowment is not adequate for meeting the problems that the world faces." (Peter Singer, Princeton University)