I think it's already been said pretty well, but I expect the poorest and weakest to die first. I suppose that means Africa, and perhaps some areas of South America. From there - assuming global recession and some climate change - India looks ripe for dieoff.
At that point, things start getting more interesting. The U.S. will probably be facing budgetary distress, making it likely that the social safety net will become steadily more frayed. China has some wealth - but it also has 1.3 billion people. So I suspect that we'll see some poor and sick in the U.S. and lots of Chinese dying in the next cohort.
Increasing economic stress will probably cause attempts at mass migration into the U.S. and Europe. The present inhabitants of those areas must either resist the invasion or be overwhelmed and, ultimately, destroyed. And then there's the Middle East, with lots of people, depleting oil, and insufficient crops - joining in a bidding war with China, the U.S., and others.
Yes, it should be an exciting time. Maybe profitable? I think so.
