Has the world’s food supplies kept up with population growth?
Key Issue #2 : Where has the World’s population increased?
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Transcript of Key Issue #2 : Where has the World’s population increased?
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Key Issue #2: Where has the World’s population increased?
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How do you measure population
change?
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“You can measure population change through the Crude
Birth Rate, the Crude Death Rate, and the Natural
Increase Rate.”
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The Crude Birth Rate (CBR) is the total number of live births a year for every
1,000 people alive in the society.
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The Crude Death Rate (CDR) is the total number of deaths a year for every 1,000
people alive in the society.
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The Natural Increase Rate (NIR) is the percentage by which a population grows
in a year.
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NIR = (Crude birth rate − Crude death rate) / 10
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The Total Fertility Rate(TFR) is the average number of children a woman
will have during her childbearing years.
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The Infant Mortality Rate (IMR) is the annual number of deaths of infants under 1 year
compared with total live births.
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Life Expectancy measures the average number of years a newborn can expect to
live at current morbidity levels.