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The world population was 3 billion in 1960 and by 1975 it rose to 4 billion. By 1990 it was 5 billion and in 2000 it crossed 6 billion. By 2010 it had crossed 7 billion and it is expected to cross 9 billion by 2040.

 

www.researchomatic.com/Exponential-Population-Growth-In-A...

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Uploaded on October 30, 2014