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Linear growth
is characterized by a rapidly growing population.
is demonstrated by the sequence 12, 13, 14, 15, 16.
is illustrated by the numbers 2, 4, 8, 16, 32.
is characterized by resource use and consumption.
is characterized by a slowly decreasing population.

If the world's population grew by 2% in 1998 and continued at that rate, how long would it take the Earth's population to double?
20 years
25 years
30 years
35 years
40 years

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