From the UN, via The Economist:
What if the world population looked like this in 2100? It’s safe to say that much would have changed between now and then. Assuming this is an accurate forecast (unlikely, due to notoriously inadequate understanding of fertility trends), which of these countries would you want to live in come 2100? The US trend appears to my eye the best among these. China would have a huge set of problems in this scenario, especially a huge number of retired people in relation to the working population. Could India and (parts of) Africa become the next “workshops of the world”? Would it be appropriate for the UN security council to include only 2 of the 10 most populous countries? How gracefully might Russia and Japan fade from view?
