26Year Population 1 200 million 1000 275 million 1500 450 million 1650 1750700 million18041 billion18501.2 billion19001.6 billion19272 billion19502.55 billion19552.8 billion19603 billion19653.3 billion19703.7 billion19754 billion19804.5 billion19854.85 billion19905.3 billion19955.7 billion19996 billion20066.5 billion20096.8 billion20117 billion20258 billion20509.4 billion
27Humans can alter their environment thus affect the POPULATION GROWTH RATE.
281. Famine2. Eradicate Disease3. War4. Better food production
29Calculating Growth Rate Growth rate (r) = birth rate (b)+ I – death rate (d) + E
30Immigration – movement of individuals into a population Emigration – movement of individuals into a population
31Doubling time – time needed for population to double in size Zero population growth – birthrate = death rate
32Birthrate – number of live births per 1000 in a given year Death rate – number of deaths per 1000 in a given year
33Demographics of Countries Demographics – applied science that deals with population statistics.
34Developed countries1. Low birth rates2.Low infant mortality rates. (the # of infant deaths per 1000 live births)
35Developed countries 1996 US 7.5/1000 for infant morality World average 62/1000
36Developed countries3.Usually have longer life expectancy
37Developed countries4.Examples of developed countries:US, Canada, Sweden, Germany, France, Australia, Japan
38(most S. American nations) Developing CountriesModerately developed countriesExamples:1. Mexico2. Turkey3. Thailand(most S. American nations)
39Examples: 1. Bangledesh 2. Niger Ethiopia Laos Cambodia Less developed countriesExamples:1. Bangledesh2. NigerEthiopiaLaosCambodia
40These countries have ………… High birth and mortality rates than developed countriesShort life spans
41Another factor to examine is the replacement level fertility Another factor to examine is the replacement level fertility. This is number of children a couple must have to “replace” themselves. Replacement rate is 2.1 children in developed countries.
42The replacement rate in developing countries is 2.7 children.
43Age Structure of Countries In order to predict future population it is important to know the age structure.
44Age Structure of Countries Age structure is the number and proportion at each age in a population. The number of males and females at each age.
45The overall structure of the age tells whether the population is increasing, stable or shrinking.
46Stable growth – approximately the same number of individuals at each age grouping
47Rapid growth – a large proportion of the population is 19 years old or younger
48Slow growth – a large proportion of population is 55 years old or younger
49Declining growth – the largest portion of the population is 20-40 years, smaller groups are younger