The population is increasing quicker in the poorer parts of the world. In these parts of the world with a higher child mortality rate and needing more children to work families with several children is considered normal. With the mortality rate reducing it does not take many generations especially with them having babies at a young age before there is a big increase in numbers.
The other thing is we have not had a major world conflict for 75 years or bad pandemic for 100 years. 40 million 1st world war, 50 million Spanish flu and 85 million 2nd world war.
Most modern developed countries population stays consistent or even decreases, places like Japan have a problem that they have an ageing population as many couple have only had one child for a few decades.
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