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QUESTION: Why have traffic, urban sprawl, destruction of farmland and eco-systems,
and school overcrowding gotten worse since 1970?
A:
More than 80 million people have been added to U.S. since 1970
This
has been an incredible surge, considering that since 1972 Americans
have had below-replacement-level
fertility.
(Click
on any word in the chart to view an explanation.)

Questions
about the illustration above
Is population growth the sole
cause of the worsening traffic, urban sprawl, etc.?
Why do these charts start
at 1970?
What is below-replacement-level
fertility?
What is the source
for the chart?
What does the blue
block on the chart mean?
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