Components of Population Change 2.3. Recap Learning targets 2.1 and 2.2 Which measure of density is the best indicator as to whether a country will have.

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Presentation transcript:

Components of Population Change 2.3

Recap Learning targets 2.1 and 2.2 Which measure of density is the best indicator as to whether a country will have enough food to feed their people? –physiological Which measure of density would be the best indicator of a country’s level of development? –agricultural

Recap Computer lab activity –Population and migration

Terms/Concepts Natural Increase Rate (NIR) Crude Birth Rate (CBR) Crude Death Rate (CDR)

Population Why is it important to study? –2 questions WHERE and WHY –7 billion people alive, more than any other time in history –Population increasing at faster rate than ever in history –All global population growth is concentrated in LDCs (more MDCs at 0 percent growth)

Population Demographics –Study of characteristics of the population –Census statistics –Could be used in marketing, political research and campaigning

Why does population growth vary among countries? What factors influence population growth – pair share –Amount of food –Birth / death rates –Life expectancy –Culture contraceptives –Others

Components of Population Change Depending upon births and deaths; populations can increase, decrease or stay constant 3 Indicators / Measures of Change –NIR –CBR –CDR

Natural Increase Rate Natural Increase Rate (NIR) –Percentage by which a population grows in a year –Only uses birth and death rates –Migration excluded (immigration/emigration) Map: LDC vs. MDC –LDC = less developed country (developing) –MDC = more developed country More then 97 percent of the natural increase is clustered in developing countries

Doubling Time Doubling time –Number of years needed to double a population, assuming a constant rate of natural increase –At a rate of 1.2% per year, world pop. would double in about 54 years –With current rate global pop. = 24 billion by 2100

Crude Birth Rate Crude Birth Rate (CBR) –the total number of live births in a year for every 1,000 people alive in society –Ex. A CBR of 20 means that for every 1,000 people in a country, 20 babies are born over a 1-year period

Crude Death Rate (CDR) Crude Death Rate- the total number of deaths in a year for every 1,000 people alive in the society NIR = CBR – CDR –Ex. 20 – 5 = 15 (1.5%)

CBR CDR

Terms/Concepts Natural Increase Rate (NIR) Crude Birth Rate (CBR) Crude Death Rate (CDR)

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