It took more than 100 years for the world’s population to double from 1 billion to 2 billion. How long did it take for the world’s population to increase from 4 billion to 5 billion?
a) Fewer than 15 years as the result of exponential growth
b) Half the time of the first doubling, about 50 years
c) More than 100 years; 1 billion people are added each 100 years
d) The world’s population has not yet reached 5 billion
a) Fewer than 15 years as the result of exponential growth
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