Should this change the way we live? The population has grown hugely in the last two hundred years. But now the number of people on Earth will start falling again.
Human race has reached its peak say experts
Fertile ground: When agriculture was invented there were just 15 million humans on Earth. Glossary
Population - All of the people that live in a place.
Average - Typical or usual.
Replacement rate - The rate of births needed for babies to replace their parents.