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Chapter 4

Chapter 4. Section 2 Human Population. Human Population Growth. The study of populations is called demography Which includes the following: Size Density Movement Distribution Birth & Death Rates. Interpreting the Graph. Graph shows relatively stable populations, until recently.

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Chapter 4

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  1. Chapter 4 Section 2 Human Population

  2. Human Population Growth • The study of populations is called demography • Which includes the following: • Size • Density • Movement • Distribution • Birth & Death Rates

  3. Interpreting the Graph • Graph shows relatively stable populations, until recently. • There has been a recovery after the bubonic plague • 1 billion in 1804 • 6 billion in 1999 • 7 billion in 2012 • 9 billion in 2050

  4. Technology Advances • Environmental conditions have kept the size of our population at a relatively constant number • This has been below our environments carrying capacity. • Humans have learned to alter the environment in ways that appear to have changed it carrying capacity.

  5. Human Population Growth Rate • Even though our population is still growing, the rate at which it is growing has slowed

  6. Interpreting the Graph • Sharp dip in population growth in 1950’s • Population reached its peak at over 2.2% in 1963 • By 2009, the percent increased had dropped to less than 1.2% • Population models predict the PGR to be below 0.6% in 2050 • The decline in population growth is due primarily to disease and voluntary population control

  7. Trends in Human Population Growth • Population trends can be altered by • Disease & War • Human population growth is not the same in all countries • But trends are often similar in counties that have similar economies. • Developing countries will add more people to the world population as compared to the amount of people added in the industrially developed countries.

  8. PGR% PGR %

  9. Zero Population Growth • ZPG occurs when births plus immigration is equal to deaths plus emigration. • Once this is reached, the age structure eventually should be more balanced • Meaning the following should be equal • Pre-reproductive • Reproductive • Post-reproductive

  10. Age Structure • The base of a country experiencing rapid growth, such as Kenya is very wide. • Most of the people in a country experiencing negative growth, such as Germany are in later reproductive and post-reproductive stages

  11. Human Carrying Capacity • Scientists are concerned about the human populations reaching or exceeding the Carrying Capacity(CC). • What happens if we do? • Overcrowding • Disease • Starvation • However, technology and planning may be able to keep populations at or below it CC. • An important factor in keeping populations at or below the CC • Is the amount of resources form the biosphere that are used by each person.

  12. Human Use of Resources • Currently, individuals in industrially developed countries use far more resources then those in developing countries. • At some point, the land needed to sustain each person on Earth might exceed the amount of land that is available.

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