How the world got to 8 billion people - and where next

The global population has hit eight billion, the UN has announced. Demographers chose 15 November to mark this milestone - though it could be up to a year or two on either side.

So, how did we get here and where might we end up? Watch this video to see the BBC's global population correspondent Stephanie Hegarty explain the numbers.

Video by the Video Formats team.