Human Populations Continued

Mr. Haase

Demographic Transition

• Stage III Industrial– Population growth slows because the birth rate

decreases and becomes close to death rate– Population stabilizes

Demographic Transition

• Stage VI Postindustrial– Birth rate drops below replacement level– Population begins to decrease

It can take many generations for demographic transition to occur.

Women

• Females have the primary influence over reproductive rates. – large amount of energy invested in bearing young

Educated women find that they do not need to bear as many children.

How does education of women influence the development of an area?

-Educated women find that they do not need to bear as many children

-Better family planning techniques• “A healthy, educated woman is better able to

participate in the development of her community and more likely to make or influence decisions about marriage and childbearing.”

-As countries modernize, the elderly do not need younger ones to care for them

Rapid growth

The Human Population Over Time

Year Population1500 500,000,000

1600 545,000,000

1700 610,000,000

1800 1,000,000,000

1900 1,600,000,000

1930 2,000,000,000

1960 3,000,000,000

1975 4,000,000,000

1987 5,000,000,000

1999 6,000,000,000

2011 7,000,000,000

How do we manage population growth?

• Infrastructure: facilities and services that support a community– Water supply– Sewer system– Roads – Schools – HospitalsTOO MANY PEOPLE IN ONE AREA CAN OVERWHELM

THE INFRASTRUCTURE OF A COMMUNITY

Problems

• Water usage• Land usage• Energy usage• Waste production• Water and air pollution• Natural resources

Land usage

Arable land- can be used to grow crops-About 1/4 of earth is land-1/8 of that is uninhabitable-The other 1/8 is habitable but not suitable for

growing crops-Only 1/32 of Earth’s surface can be used to

grow crops