  All of these views, conventionalist and not, identify various moral properties with non-problematic natural features of the world. As a result, they are commonly characterized as versions of naturalism and are contrasted with non-naturalist views that see morality as presupposing, or being committed to, properties over and above those that would be countenanced by natural science. Non-naturalism comes with two distinctive burdens: (i) accounting for how the realm of moral properties fits in with familiar natural properties and (ii) explaining how it is that we are able to learn anything about these moral properties. Naturalism, in contrast, avoids these metaphysical and epistemological burdens.