It is widely agreed that normative properties supervene on natural properties. Non-naturalists face a distinctive challenge to explain this relation. Stephanie Leary argues that non-naturalists can meet this explanatory demand by positing the existence of hybrid normative properties. I argue that this proposal does not meet the supervenience challenge.

It’s commonly held that particular moral facts are explained by ‘natural’ or ‘descriptive’ facts, though there’s disagreement over how such explanations work. We defend the view that general moral principles also play a role in explaining particular moral facts. More specifically, we argue that this view best makes sense of some intuitive data points, including the supervenience of the moral upon the natural. We consider two alternative accounts of the nature and structure of moral principles—’the nomic view’ and ‘moral platonism’—before (...) considering in what sense such principles obtain of necessity. (shrink)