Growth Increases and Decreases Natural Increase Fertility Mortality Natural Increase Rates Fig 27 The natural increase rate NIR is the percentage growth or decline in the population of a country per year not including net migration Countries in Africa and Southwest Asi ID: 912701
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Slide1
Distribution of World Population
Growth
Increases and Decreases
Natural IncreaseFertilityMortality
Slide2Slide3Slide4Slide5Slide6Slide7Slide8Slide9Slide10Slide11Slide12Natural Increase Rates
Fig. 2-7:
The natural increase rate (NIR) is the percentage growth or decline in the population of a country per year (not including net migration). Countries in Africa and Southwest Asia have the highest current rates, while Russia and some European countries have negative rates.
Slide13Crude Birth Rates
Fig. 2-8: The crude birth rate (CBR) is the total number of births in a country per 1000 population per year. The lowest rates are in Europe, and the highest rates are in Africa and several Asian countries.
Slide14Total Births
Slide15Slide16World Population Growth
1950 - 2005
Fig. 2-6: Total world population increased from 2.5 to over 6 billion in slightly over 50 years. The natural increase rate peaked in the early 1960s and has declined since, but the number of people added each year did not peak until 1990.
Slide17Rates of Natural Increase
Crude Birth Rate (CBR)
- Total # of live births per year for every 1,000 people aliveCBR of 20 means that for every 1,000 people, 20 are born over a one year periodCrude Death Rate (CDR)- Total # of deaths a year for every 1,000 people aliveNatural Increase Rate (NIR) is the % by which a population grows in a yearSubtract CDR% from CBR%Population may still be increasing despite a decreasing NIRDoes not take into account migration into a country/region
Slide18Practice:
Country ACBR of 45/1,000CDR of 21/1,000%NIR?
Country B
CBR of 13/1,000
CDR of 23/1,000
%NIR?
4.5%
2.1%
2.4%
2.3%
1.3%
-1%
Slide19Natural Increase Rates
Fig. 2-7:
The natural increase rate (NIR) is the percentage growth or decline in the population of a country per year (not including net migration). Countries in Africa and Southwest Asia have the highest current rates, while Russia and some European countries have negative rates.Impact of Small changes on the NIR - even a 1% change is huge considering the base population (the difference between 1 and 2% could be the difference between adding 66 million or 132 million a year!Doubling Time- how long it takes for the population to doubleIf we had continued at 2.2% world pop in 2100 would be 15 billion
Slide20Source: United Nations Population Division,
World Population Prospects, The 2008 Revision.
World Population Growth, 1950–2050
Slide21Crude Birth
Rates and Total Fertility Rates (TFR)
Fig. 2-8: The crude birth rate (CBR) is the total number of births in a country per 1000 population per year. The lowest rates are in Europe, and the highest rates are in Africa and several Asian countries.Total fertility rate (TFR) refers to the average number of children a woman will have throughout her child bearing years (15-49)
Slide22Infant Mortality Rates
Fig. 2-10: The infant mortality rate is the number of infant deaths per 1000 live births per year. The highest infant mortality rates are found in some of the poorest countries of Africa and Asia.
Infant mortality rate (IMR) is the annual number of deaths of infants under 1 year of age per 1,000 live births
Slide23Life Expectancy at birth
Fig. 2-11: Life expectancy at birth is the average number of years a newborn infant can expect to live. The highest life expectancies are generally in the wealthiest countries, and the lowest in the poorest countries.
World Life ExpectanciesLife Expectancy at birth measures the average number of years a newborn infant can expect to live at current mortality levels
Slide24Crude Death Rates
Fig. 2-12: The crude death rate (CDR) is the total number of deaths in a country per 1000 population per year. Because wealthy countries are in a late stage of the Demographic Transition, they often have a higher CDR than poorer countries.