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Environmental Problems Environmental Problems Lots of people mean lots of waste lots by ewghwehws

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									Environmental Problems

 Lots of people mean lots of waste,
 lots of food, lots of babies, lots of
energy, lots of houses, lots of roads,
        lots of cars, lots of. . .
 Population: Factors that affect
        population size
• Birth rate
• Death rate
• Since we can’t leave the earth
  and hope there are no aliens
  coming to earth, emigration and
  immigration are not considered
• annual rate of
  population growth is
  presently _____.
• 1965 = 2%
• 1993 = 1.7%
     Can the rate drop and the
     population still increase?
• The world’s population was 3.2 billion in
  1965 and the growth rate was 2% . The
  increase was 70 million.

• The world’s population was 5.5 billion in
  1993 and the growth rate was 1.7%. The
  increase was 94 million.
Factors affecting birth rates and
         fertility rates
                • Average level of education and
                  affluence
                • Urbanization - children as labor
                  for family in rural homes
                • Cost of raising and educating
                  children
                • Educational and employment
                  opportunities for women
                • Infant mortality rate
                • Average marriage age
                • Access to birth control
                • Religious beliefs
Factors affecting death rates
              • Better nutrition

              • Fewer infant deaths
                and longer average life
                expectancy

              • Improvements in
                medical and public
                health technology
     Population Age Structures
• Age structure diagrams show the potential
  growth of a nation’s population.
• Populations are divided into three age
  groups: prereproductive (0-14),
  reproductive (15-44), and post reproductive
  (45 - 85+).
• Nations with a large number of pre
  reproductive population will _________.
Demographic Charts with
  Population Numbers
Population age structures
Tracking the baby boomers
Population prediction LDC &
           MDC



                         1985
                         1985
                          to
                         2025
            Carrying capacity
• Carrying capacity - is    • Limiting factors
  the maximum                 control the carrying
  population that an area     capacity:
  can support for an        •   food
  indefinite period         •   space
• It is unknown what the    •   waste build up
  earth’s carrying          •   disease
  capacity is               •   clean water
          Population Questions
• Why is it rational for a   • Why are falling birth
  poor couple in India to      rates not necessarily a
  have six or seven            reliable indicator of
  children? What               future population
  changes might induce         growth trends?
  such a couple to           • Do you believe there
  rethink their                are physical limits to
  reproductive lives?          human population
                               growth on Earth?

								
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