VIDEO: 7 Billion people
01 November 2011, 10:20
Nairobi - The world celebrated the birth of the seven billionth baby on 31 October, and countries around the world celebrated the demographic milestone.
With about two babies being born every second, the seven billion figure will keep racing ahead in decades to come - to more than 10 billion by 2100, according to UN estimates.
The UN predicts that India will overtake China as the world's most populous nation by 2025, when it will have almost 1.5 billion people.
Watch this National Geographic video of the 7 billion people: