A World Consensus on Human Rights?

What would it mean to come to a genuine, unforced international consensus on human rights? I suppose it would be something like what John Rawls describes in his Political Liberalism as an “overlapping consensus.” That is, different groups, countries, religious communities, civilizations, while holding incompatible fundamental views on theology, metaphysics, human nature, and so on, would come to an agreement on certain norms that ought to govern human behavior. Each would have its own way of justifying this from out of its profound background conception. We would agree on the norms, while disagreeing on why they were the right norms. And we would be content to live in this consensus, undisturbed by the differences of p...