The United Nations projects the world population to reach nearly 11 billion by the end of the century
Growth rates vary, though, and some countries will likely see their populations shrink.
The UN report projects the world's population to hit 9.7 billion in 2050, and peak by the end of the century at 10.9 billion.
One reason, it says is longer life expectancies, which is projected to rise from the current 72.6 years to around 77 years by 2050.
Half of the population growth between now and 2050 is expected to come from just nine countries, including India, Nigeria and Pakistan.