According to your article 9 billion is still a safe estimate: The world population is projected to reach 8.5 billion in 2030, and to increase further to 9.7 bi

According to your article 9 billion is still a safe estimate: The world population is projected to reach 8.5 billion in 2030, and to increase further to 9.7 billion in 2050 and 11.2 billion by 2100. As with any type of projection, there is a degree of uncertainty surrounding these latest population projections. These figures are based on the medium projection variant, which assumes a decline of fertility for countries where large families are still prevalent, as well as a slight increase of fertility in several countries with fewer than two children per woman on average. Survival prospects are also projected to improve in all countries.