Could you name monetary cost or number of people killed that would make it important enough to do something about?
That is a silly question. If AGW is indeed the absolute truth and global warning would actually cause the death of people, then the answer is obvious: As the climate change is being cause by humans, less humans would mean less climate change. The more die, the less of a problem it becomes.
FWIW, global thermonuclear war in the 60's would have fixed this little problem. But noooooo, couldn't have that could we? Damn hippies and your "no nukes" jibber-jabber. Now look what you did!