Chapter 6 Flashcards

Human Population

1
Q

When did the human population reach 1 billion?

A

after 1800

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2
Q

Country’s doubling time

A

70/(annual percentage growth rate)

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3
Q

What are reasons for human population growth?

A

advances to technology, sanitation, agriculture, and practices that reduce death rates

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4
Q

Thomas Malthus

A

British economist who argued that the number of people would eventually outgrow the available food supply

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5
Q

Green Revolution

A

resulted in intensified food production with the increasing population

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6
Q

What are negative impacts of increased population size?

A

depletes resources, stresses social systems, degrades the natural environment

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7
Q

IPAT model

A

(I)mpact = (P)opulation x (A)ffluence x (T)echnology

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8
Q

Increased population (IPAT)

A

more individuals take up space, use resources, and generate waste

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9
Q

Affluence (IPAT)

A

greater per capita resource consumption

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10
Q

Technology (IPAT)

A

enhances ability to exploit resources/decrease impact by improving efficiency

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11
Q

Demography

A

study of statistical changes in the human population

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12
Q

Demographers

A

study characteristics of the human population: size, distribution, age structure, sex ration, birth/death/emigration/immigration rates

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13
Q

What population size is the global population predicted to surpass by 2050?

A

9.7 billion

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14
Q

Age structure diagrams/population pyramids

A

describe relative numbers of individuals of each age class in a population (lower ages at the bottom)

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15
Q

What is the predicted median age in 2050?

A

36

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16
Q

What is the naturally occurring sex ratio at birth?

A

106 males:100 females

17
Q

Infant mortality rates

A

frequency of children dying in infancy (which has decreased)

18
Q

Total fertility rate (TFR)

A

average number of children born per woman during her life time (decreased due to industrialization, improved women’s rights, healthcare)

19
Q

Replacement fertility

A

TFR that keeps the population size stable (2.1)

20
Q

Rate of natural increase

A

includes only birth and death rates

21
Q

Life expectancy

A

average number of years a person in an age group is expected to live, increased in industrialized countries

22
Q

Demographic transition

A

stages of economic/cultural change for industrializing countries

23
Q

Pre-industrial stage

A

high death rates due to widespread disease, rudimentary healthcare, unreliable food supplies (people compensate for infant mortality by having many children); population growth is stable

24
Q

Transitional stage

A

declining death rates due to improved food production and health care, but similar birth rates; high population growth

25
Q

Industrial stage

A

employment opportunities increase for women and birth control becomes more accessible, decreasing birth rates; population growth begins to stabilize

26
Q

Post-industrial stage

A

population growth stabilizes/shrinks

27
Q

Demographic fatigue

A

developing countries become so overpopulated they cannot complete a transition (many sub-Saharan African countries)

28
Q

What economic/societal factors affect fertility?

A

access to contraceptives, acceptance of contraceptives, women’s rights, cultural influences, level of affluence, child labor, government support for retirees

29
Q

Family planning

A

effort to plan number and spacing of children

30
Q

Birth control

A

efforts to reduce frequency of pregnancy

31
Q

Contraception

A

attempt to prevent pregnancy while having sex

32
Q

Reproductive window

A

time in which women can become pregnant

33
Q

Biocapacity

A

amount of biologically available land

34
Q

Ecological deficit

A

result of overshoot (human ecological footprint exceeds biocapacity)

35
Q

Ecological reserve

A

result of a footprint less than biocapacity