There is a raging debate going on about global warming. Sarah Palin and those who agree with her think the evidence has been trumped up and there is no good reason to believe in man-made global warming. Al Gore thinks the evidence for man-made global warming is clear and decisive.
I think we can all agree, whatever side we are on in this, that one of these groups of people has to be wrong. So why do people think that it follows from a diversity of moral opinions that moral judgments are neither true nor false?