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WHAT FACTORS INFLUENCE THE SIZE OF THE HUMAN POPULATION? What are the two key concepts for this section? List three variables that affect the growth and decline of human populations. How can we calculate the population change of an area? Define the total fertility rate (TFR). How has the global TFR changed since 1955? Summarize the story of population growth in the United States. List six changes in lifestyles that have taken place in the United States during the 20th century, leading to a rise in per capita resource use.

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Environmental Science (MindTap Cou...

16th Edition
G. Tyler Miller + 1 other
Publisher: Cengage Learning
ISBN: 9781337569613

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Chapter
Section
BuyFindarrow_forward

Environmental Science (MindTap Cou...

16th Edition
G. Tyler Miller + 1 other
Publisher: Cengage Learning
ISBN: 9781337569613
Chapter 6, Problem 3CR
Textbook Problem
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WHAT FACTORS INFLUENCE THE SIZE OF THE HUMAN POPULATION?

What are the two key concepts for this section? List three variables that affect the growth and decline of human populations. How can we calculate the population change of an area? Define the total fertility rate (TFR). How has the global TFR changed since 1955? Summarize the story of population growth in the United States. List six changes in lifestyles that have taken place in the United States during the 20th century, leading to a rise in per capita resource use.

To determine

Two key concepts of the given section. The variable that affects the growth and decline of the human population. The way in which the population change of an area is calculated. The total fertility rate (TFR) and change in TFR, since 1955. The scenario of population growth in the United States. Six lifestyle changes in the United States during the 20th century that led to an increase in per capita resource utilization.

Explanation of Solution

Two key concepts of the given section are explained as follows:

(i) The size of the population is increased due to an increase in birth rate and immigration, and decreased due to death rate and emigration.

(ii) The most important factor that determines the population size is the total fertility rate (TFR).

The two variables that increase the population are birth rate and immigration, and the two factors that decrease the population are death rate and emigration.

The change in population is calculated as follows:

Populationchange=(Births+Immigration)-

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