I balked at his TED talk when I first heard about it years ago, but these days I don't see how it couldn't be true. This is pretty much directly related to the questions asked in this thread, and having stumbled across it just now, I think it might be useful.
Also, apparently he has a challenge (the moral landscape challenge, look it up), in which he is offering 2-20 thousand dollars to anyone who can successfully refute him.
CHECK IT OUT!
EDIT: here's a vid to summarize: