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Figure This!
 

Why is the spread between the low, middle, and high estimates so small in the year 2000 and so large in the year 2100?

What factors will affect US population growth in the next 100 years? What factors will affect global population growth? Will these factors be the same?

 

The low estimate on the graph predicts a decrease in the US population between 2050 and 2100. What might cause such a decrease?

 

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