We are 7 billion, how your number?

The world celebrated the beginning of this month the arrival of the human population to 7 billion people. Imagine that the human population has doubled over the past 50 years only!!, How will our situation during the next fifty years?!
If you want to find out your ranking in the approximate 7 billion you can experience this program is interesting from the BBC: Click here

http://www.bbc.co.uk/news/world-15391515

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