[Projoy] "Emergent phenomenon" isn't an alternative to other explanations -- it exists alongside them. For example, I am of the opinion that the mind is literally a physical process of the brain, which assembles itself by knowable (though currently almost entirely unknown) physical processes, so all the stuff we do is an emergent phenomenon of the molecules. That doesn't mean that that stuff -- thoughts, sensations, consciousness, etc. -- doesn't exist, although discoveries about the physical stuff can call into question our naive ideas about our experiences of our minds. As a last remark, I don't want to give the impression of hinting at mysterious mystical revelations (and I cynically suspect that a lot of accounts of such are describing nothing more mysterious than a minor stroke). The experiences that I can find no adequate way of communicating are no more than a few personal development courses I've taken, following which some religious language became a lot more comprehensible, and reading in a couple of quasi-religious traditions of disputed provenance (the works of Gurdjieff and Idries Shah).
Ahh. So you're saying that objective morality is a high-level description for a de facto emergent phenomenon? Well, we agree, then! It's only if you're insisting it's transcendent of the nuts and bolts of human behaviour and psychology that we have a fundamental disagreement.