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Human Population

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Human Population Unit 5 Environmental Science 1 Exponential Growth Characterized by doubling Starts slowly, but rapidly increases Total growth in one doubling is more ... – PowerPoint PPT presentation

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Title: Human Population


1
Human Population
  • Unit 5
  • Environmental Science 1

2
Exponential Growth
  • Characterized by doubling
  • Starts slowly, but rapidly increases
  • Total growth in one doubling is more than the
    total of all preceding growth
  • Exponential growth occurs when the rate of growth
    is directly proportional to the number present
  • ?N/?t N

3
Exponential Growth
  • Doubling time equation is
  • Doubling time 70/ of annual growth (r)
  • So if the annual growth rate is 2 then 70/235
    years to double the population

4
Human Population
  • A group of organisms living in a group is called
    a population
  • Population growth leads to an increase in food,
    energy, pollution and other resource consumption
  • Energy is a major concern as the population grown

5
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6
Human Population
  • Carrying capacity is the maximum population Earth
    can reasonably sustain an average standard of
    living
  • In the beginning of history the world population
    has changed very little because the death rate
    and birth rate were relatively equal
  • However, recently the birth rate began to out
    number the death rater?
  • Why?

7
Human Population
8
Human Populations
  • Changes in population size are recorded and
    monitored by demographers
  • Demographers use the numerical equation to
    express changes in the population
  • Population growth Birth rate death rate
  • This does not take into consideration immigration
    and emigration

9
Human Populations
10
Developed vs. Developing Countries
  • Developed countries are technologically advanced
    and have a high standard of living
  • Developing countries have a low standard of
    living
  • Developed countries tend to have a lower growth
    rate because of better education and health care
  • Developing countries have higher birth and death
    rates

11
Developed vs. Developing Countries
12
Developed vs. Developing Countries
13
Developed vs. Developing Countries
14
World Population Trends
  • In 2000 the population surpassed 6 billion
  • The population has reached 7 billion as of 2011
  • The current growth rate is about 1.3 with a
    doubling time of about 54 years

15
World Population Trends
  • 98 of the growth is occurring in developing
    countries
  • The growth rate has slowed since 1965 why?

16
World Population Trends
  • It is predicted that the worlds population will
    stabilize at 10.2 billion by 2100 and the
    replacement level of 2 children per couple will
    be reached by 2035
  • However, some say the population will not
    stabilize until 11.2 billion

17
World Population Trends
  • How did they come up with this data?
  • Declining importance of children needed for labor
  • Increased cost of raising children
  • Improved social status of women
  • Rising education level and improved employment
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