1. Population Growth 2

2. I can identify factors that contribute to population growth.
I can identify how civilizations began.
Best guess
Class questions

3. Population Growth Population Growth
Change to population could be and increase or a decrease.
birth rate
the number of births each year per 1,000 people
Example:
Birth rates are used to calculate population growth
death rate
the number of deaths each year per 1,000 people
Death rates are used to calculate population growth.
Subtract estimated Birth rate from Death rate what do you get?

4. So where do these number come from?
The rough idea of the number of people is learned from the United Nations. Each member nation conducts a census every 10 years and reports that number to the UN. Countries that are not members do not participate. As a result, all population numbers are rough estimates
Census
the periodic count of a nation’s population by its government

5. Why do they matter??
What things affect the birth rate or the death rate in a place?
How have birth and death rates changed over time?
Why do birth and death rates matter?

6. Look at the “Population Growth” data chart
analyze the data with a partner and then answer the two questions to the left of the chart.

8. Possible Answers
1 It took almost 2000 years for the population to grow from 200 million to 1 billion but only around 100 years to grow from 1 billion to 2 billion.
After 4 billion population growth slowed a bit.
2. Will the population growth rate slow down more?

9. Year 1500
The following map shows areas of greatest population for year Each dot represents a million people. In areas where populations are widely dispersed, dots have been placed in the middle of an approximate range. Write a description of the distribution of people shown on the map. Why Is this way

10. Lets look at years what would the population density map look like why was there little growth
Is there a large population growth from

12. Year 1500
The following map shows areas of greatest population for year Each dot represents a million people. In areas where populations are widely dispersed, dots have been placed in the middle of an approximate range. Write a description of the distribution of people shown on the map. Why Is this way

13. population in years
turn and talk with a partner about the change
changes they notice

14. Why was there little/slow growth?
Death rate was high due to lack of medical care, poor sanitation, plagues, etc
What Areas appear to be growing? Why
What is the movement of people called
Migration

15. Year 1500
The following map shows areas of greatest population for year Each dot represents a million people. In areas where populations are widely dispersed, dots have been placed in the middle of an approximate range. Write a description of the distribution of people shown on the map. Why Is this way

16. population in years
turn and talk with a partner about the change
changes they notice

22. population projections are based on educated guesses about birth rates and death rates.
Where are the most densely populated places likely to be in 2050?
Why do you think this is what is projected?
If the world reaches 9 billion by 2050 as this map projects, what might be some of the issues facing the Earth’s people?

23. natural increase What is “natural increase”
Natural causes that cause your population to change.
Birth rate – Death Rate
is the term demographers apply to the difference between birth and death rates. the birth rate minus the death rate “Calculating Natural Increase”
‘more developed countries’ and ‘less developed countries’ which were
complete the following by calculating the natural increase rates and jotting answers to the two questions below the chart.

24. Calculating Natural Increase
Directions: Calculate the natural increase per year, day and minute for each column below.
World
More developed countries
Less developed Countries
Population, 2012
7,057,075,000
1,243,018,000
5,814,057,000
Births per
Year
140,541,944
13,923,718
126,618,226
Day
385,046
38,147
346,899
Minute
267 26
241
Deaths per
56,238,002
12,191,662
44,046,340
154,077
33,402
120,675
107 23 84
Natural increase per
1. What conclusions can be drawn from the data?
2. What implications does this data have for the world?

26. Population growth rates are higher in less developed countries than they are in more developed countries. Thus, the poorest countries tend to experience the most population growth.
what might impact population growth in a country besides birth and death rates?
Migration
The movement of people

27. Projected Population (2050) 138 million Lifetime Births per Woman 5.4
Tanzania
Spain
Population (2012)
48 million
46 million
Projected Population (2050)
138 million
Lifetime Births per Woman
5.4
1.4
Annual Births
1.9 million
483,000
Percent of Population Below Age 15
45%
15%
Percent of Population Ages 65+ 3%
17%
Percent of Population Ages 65+ (2050) 4%
33%
Life Expectancy at Birth
57 years
82 years
Infant Mortality Rate (per 1,000 live births) 51
3.2
Annual Number of Infant Deaths
98,000
1,600
Comparing Two Countries
1. How do the 2012 populations of Tanzania and Spain compare?
2. How do the 2050 projected populations of Tanzania and Spain compare?
3. Which country is growing at the highest rate? Why do you think this is true?
4. Why do you think it is important to consider the percent of population below age 15 when estimating population growth for the future?
5. How might high infant mortality and infant death rates impact decisions about how many children to have in Tanzania?