11 billion people are projected to be in the world by end of the century
"High fertility rates in Africa lead demographers to revise their estimates of peak world population. They now expect there to be 11 billion people by the end of the century, up from 7.1 billion today" (page 19).
"Up to Speed: Two Months, One Page," Sierra Magazine 98, no. 6 (2013), 19.