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5.3 Human Population Growth
Discuss the trend of human population growth.
Explain why population growth rates differ in countries throughout the world.
Historical Overview The size of the human population has increased over time.
For most of human existence, limiting factors such as the scarcity of food kept death rates high.
As civilization advanced, agriculture, industry, improved nutrition, sanitation, and medicine reduced death rates. Birthrates stayed high in most places. This led to exponential growth.
Today, the human population continues to grow exponentially, although the doubling time has slowed.
Patterns ...view middle of the document...
DEATHRATES 3. The human population has increased because birthrates have dropped.
TRUE 4. The combination of low death rates and high birthrates led to exponential growth.
THOMAS MALTHUS 5. Charles Darwin suggested that human populations are regulated by war, famine, and disease.
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6. Complete the table below to explain how each factor affected the size and growth rate of the human population over the last 10,000 years.
|Factors That Affected Human Population Growth |
|Cause |Effect |
|Agriculture |INCREASED POPULATION SIZE AND GROWTH RATE- MORE FOOD AVAILABILITY |
|Improved health care and medicine |INCREASED POP. SIZE AND GROWTH RATE – LESS DEATH DUE TO DISEASE, ILLNESS, |
| |INFECTION |
|Improved sanitation |INCREASED POP. SIZE AND GROWTH RATE – LESS DISEASE ABLE TO SPREAD |
|Bubonic plague |DECREASED POP. SIZE, BUT GROWTH RATE ROSE SOON AGAIN AFTER |
|Industrial Revolution |INCREASED POP. SIZE AND GROWTH RATE – MASS PRODUCTION, ASSEMBLY LINE, MORE |
| |GOODS AVAILABLE (RESOURCES) |
Patterns of Human Population Growth
7. Complete the diagram below by adding...