Exponential Growth

Population Growth

• 1930 = 2 billion

• 1960 = 3 billion

• 1977 = 4 billion

• 1989 = 5 billion

• 1999 = 6 billion

• 2012 = 7 billion

Doubling Time*

• 30 years

• 17 years

• 12 years

• 10 years

• 13 years

• *Officially doubling time is the time it takes any population to double in size (i.e. twice as large)

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