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Transcript of Population Growth
How has the size of the human population changed over time?
Like the population of many other living organisms, the size of the human population tends to increase with time.
Human Population Growth
A. Limiting factors kept population sizes low.
Food was scarce
Incurable diseases were rampant
B. Only half the children in the world lived to adulthood.
C. Because death rates were so high, families had many children, just to make sure that some would survive.
D. About 500 years ago, human population began to increase.
i. Agriculture and Industry
ii. reliable food supply
iii. goods could be shipped around the globe
iv. improved sanitation
v. improved medicine and healthcare
E. Death rates started to decrease, but birthrates remained high.
(population grew at a rapid rate)
II. Patterns of Population Growth
III. Future Population Growth
World Population Clock
C. Demographic Transition
D. Age Structure
A. The human population cannot continue to grow exponentially forever because Earth and its resources are limited.
B. When and how will our population growth slow?
the scientific study of human populations
Why do population growth rates differ in countries throughout the world?
Birthrates, death rates and the age structure of a population help predict why some countries have high growth rates while other countries grow more slowly.
a dramatic change in birth and death rates
i. Population growth depends, in part, on how many people of different ages make up a given population.
graph of the numbers of males and females within different age groups of a population.
AKA: population profiles
A. To predict future growth, you need to consider:
age structure of country
prevalence of disease
B. By 2050 the growth rate may level off or even decrease.
Stage I: Birthrate and Death rate are high.
Stage II: Death rate drops while the birthrate remains high.
Stage III: Birthrate decreases.
Demographers use models called age-structure diagrams to...