Twelve new essays that demonstrate the challenges ethical naturalism poses to eliminativism and the most sophisticated versions of non-naturalism.Twelve new essays on ethical naturalism, a philosophy that redefined the agenda of ethics in the twentieth century and figures prominently in current debates. These essays demonstrate the challenges ethical naturalism poses to eliminativism in its various non-cognitivist forms and to the most sophisticated versions of non-naturalism.Twelve new essays on ethical naturalism, a philosophy that redefined the agenda of ethics in the twentieth century and figures prominently in current debates. These essays demonstrate the challenges ethical naturalism poses to eliminativism in its various non-cognitivist forms and to the most sophisticated versions of non-naturalism.Ethical naturalism is narrowly construed as the doctrine that there are moral properties and facts, at least some of which are natural properties and facts. Perhaps owing to its having faced, early on, intuitively forceful objections by eliminativists and non-naturalists, ethical naturalism has only recently become a central player in the debates about the status of moral properties and facts which have occupied philosophers over the last century. It has now become a driving force in those debates, one with sufficient resources to challenge not only eliminativism, especially in its various non-cognitivist forms, but also the most sophisticated versions of non-naturalism. This volume brings together twelve new essays which make it clear that, in light of recent developments in analytic philosophy and the social sciences, there are novel grounds for reassessing the doctrines at stake in these debates.Introduction; 1. Naturalism in moral philosophy Gilbert Harman; 2. Normativity and reasons: five arguments from Parfit against normative naturalism David Copp; 3. Naturalism: feel the width Roger Crisp; 4. On ethical naturalism and the philosophy of language Frank Jacksonló5