Naturalizing Metaethics1 Introduction1.1 Methodological preamble1.2 A roadmap to metaethics2 Empirical resolutions to metaethical debates2.1 Sentimentalism vs. rationalism and externalism2.2 Cognitivism vs. non-cognitivism2.3 Realism vs. the error theory2.4 Sensibility vs. moral sense2.5 Relativism vs. ideal observers3 Conclusion