Human Population Size - PowerPoint PPT Presentation

Loading...

PPT – Human Population Size PowerPoint presentation | free to download - id: 72750f-OGQ4Z



Loading


The Adobe Flash plugin is needed to view this content

Get the plugin now

View by Category
About This Presentation
Title:

Human Population Size

Description:

Questions for Today: What are the Major Factors that affect Human Population Size? How are fertility rates analyzed? What are the factors that affect Birth and ... – PowerPoint PPT presentation

Number of Views:27
Avg rating:3.0/5.0
Slides: 17
Provided by: jero132
Learn more at: http://campuses.fortbendisd.com
Category:
Tags: human | population | size

less

Write a Comment
User Comments (0)
Transcript and Presenter's Notes

Title: Human Population Size


1
Human Population Size
2
Questions for Today
  • What are the Major Factors that affect Human
    Population Size?
  • How are fertility rates analyzed?
  • What are the factors that affect Birth and
    Fertility Rates?
  • What are factors that affect Death Rates?
  • What factors affect Migration?

3
Factors that affect Population Size
  • There are three factors that affect population
    size
  • Births (fertility)
  • Death (mortality)
  • Migration
  • Remember the formula to calculation Population
    Change
  • Pop. Change (B I) (D E)

4
Population Change
  • For the most of human history, the human
    population roughly grew at a slow pace.
  • Within the past 200 years, that rate has
    increased significantly.
  • Our current rate is roughly, 1.22
  • 82 million people were added to the world in
    2008.
  • An Average of 225,000 people are added daily
  • 2.4 people are added every time your heart beats.
  • http//www.worldometers.info/

5
Population Change
  • Three major factors account for this major
    increase
  • Our ability to invade new ecosystems and adapt
    fast.
  • The emergence of agriculture
  • The development of sanitation, antibiotics, and
    vaccines.

6
Factors that affect Population Size
  • Demographers use the crude birth and death rate
    to calculate population change
  • Crude rates are determined by looking at the
    number of births and deaths per 1,000 people in a
    population.
  • An estimated and extrapolated number.

7
Fig. 6-3, p. 126
8
Fertility Rates
  • Demographers also take in consideration Fertility
    Rates when calculating Population Statistics.
  • Fertility rates are the number of children born
    to a woman during her lifetime.
  • Two types of fertility rates
  • Replacement-level fertility rate
  • Total Fertility rates

9
Fertility Rates
  • Replacement Level Fertility Rates
  • The average number of children that couples in a
    population must bear to replace themselves.
  • Ranges from 2.1 in developed countries to 2.5 in
    developing countries.

10
Fertility Rates
  • Total Fertility Rates
  • The average number of children born to women in a
    population during their reproductive years.
  • The average world wide is 2.6 children per women.
  • 1.6 in developed
  • 2.8 in developing

11
Factors that affect Birth Rates
  • There are 10 factors that affect Fertility rates
  • Child Labor
  • Cost of raising and Education
  • Availability of private and public pension
    systems
  • Urbanization
  • Educational and employment opportunities for
    women.
  • Infant Mortality Rate
  • Average age of marriage
  • Availability of legal abortions
  • Reliable Birth Control
  • Religious Beliefs and Cultural Norms.

12
Factors that affect Death Rate
  • The boom in Human population growth is not
    primarily caused by the birth rate.
  • Our Death (Mortality) Rate has significantly
    dropped.
  • Death Rates have dropped due to
  • Increased Food Supply
  • Better nutrition
  • Medical Advances
  • Improved Sanitation
  • Availability of Clean Water

13
Factors that affect the Death Rate
  • Two statistics used by Demograpghers
  • Life Expectancy
  • 1955 48 ? 2008 68 ? 2050 74
  • Worldwide
  • In the US, the Life Expectancy is 78
  • Infant Mortality Rate

14
Life Expectancy
  • Two major factors that affect Life Expectancy in
    the US
  • Poor Healthcare across the Nation
  • Obesity

15
Infant Mortality
  • Infant Mortality is one of the best measures of a
    societys quality of life
  • Reflects general nutrition and pediatric health
    care
  • Three factors affect Infant Mortality Rates in
    the US
  • Inadequate Health Care
  • Drug addictions among pregnant women
  • High Teen Birth Rates

16
Migration
  • Migration is affected by the economic and social
    problems of other countries.
  • Most people leave countries to pursue better
    opportunities in another.
  • Jobs
  • Healthcare
  • Political Opposition
  • Religious Intolerance
About PowerShow.com