 IN 1999 THE EARTH'S POPULATION SURPASSED SIX BILLION PEOPLE.
It took all of human history to reach the first billion in
the 1800s, but approximately 200 years to hit six billion.
As the Earth gets more and more crowded, studying population
issues such as the distribution of our natural resources and
our collective impact on the environment will be crucial.
Demography, the study of human populations, is also increasingly
important in both the business and political sectors. Everything
from urban planning to the marketing of a new products uses
population information.
This month we explore the field of demography.
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