I think your post creates a circle back into mine. Any "global" agreement on "morality" is just that: an agreement. People can choose to disagree and ignore an agreement when it no longer serves their needs (or they can refuse to endorse it from the start because it disagrees with their view of "right" and "wrong.")
"Objective" means "without bias or prejudice": ultimately, humanly established morality will always be subject to one or both of these flaws - it is inescapable. Morality established by consensus is a necessary tool, but it cannot help mediate problems between cultures because cultures will inevitably have some areas that don't coincide in terms of "right" behavior. Without objective morality, we have to allow atrocious behavior to exist because we really don't have any right to condemn another culture's consensual idea of "right" action.
This is why God as the giver of moral law is such an important idea: the assumption being that a divine being's law is above human bias and prejudice (therefore "objective" in the purest sense of the word); as well, it is beyond human "revision" regardless of technological "advancement" (note my contemptuous quotation marks) and global "diversity."


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