Apparently they made the graph by taking estimates for 2050 and 2010 and connecting the dots. Hence, the odd inflection points for Brazil, India and China. Note

Apparently they made the graph by taking estimates for 2050 and 2010 and connecting the dots. Hence, the odd inflection points for Brazil, India and China. Note also the big caveat: Such forecasts need to be taken with a bucketload of salt: tiny shifts in today’s birth rate extrapolated over 90 years produce huge changes. I guess most of the countries depicted in the graph won't exist in the same form in 2100. I also wonder if it's possible to have another 90 years without a nuclear bomb attack somewhere.