  Allen Buchanan and Russell Powell (2018) cite ten examples of moral progress. Among them are these four: “…the large reduction, beginning with the British abolition, of the incidence of the most extreme forms of slavery…the increasing recognition and institutionalization of the equal rights of women in some countries, better treatment of some non-human animals, abolition of at least the cruellest punishments” (p. 47). While not everyone would agree even with these examples, there exists, parallel to the non-moral case, extremely broad agreement among diverse groups who have reasoned freely and interactively over extended periods. As Buchanan and Powell make clear, moral progress in such cases goes hand in hand with moral regress in many areas and unresolved deep moral differences about other issues. On the other hand, if what is in question is the bare possibility of moral knowledge, a positive answer seems warranted.