Population Change. World Population

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Presentation transcript:

Population Change

World Population

How do we know? How do we record data needed for population? Hospital records Register of births Register of deaths Census data Problems? Migration records?

Important Terms Birth Rate Number of live births per 1000 people Fertility Rate (Considers child bearing ages) Number of live births per 1000 people of child bearing age (15-44) ** Can also be used to describe the average number of children the average women will have (1.87 in UK) Death Rate Number of deaths per 1000 people Infant Mortality Number of babies who die before their 1st birthday (per 1000 live births) Life Expectancy Average age that people live to within a country/area

World Population growth Use the data on the worksheet to draw a line graph of world population growth Ext: Answer the questions on the sheet

“It is not like we suddenly started breeding like rabbits, but we stopped dying like flies” Wall Street Journal Life Expectancy NYC in 1900 = 50 In 2014 = 79

How can this graph be explained?

Natural Increase = Population change not including migration BR – DR = NI E.g. Japan BR = 8 DR = 9 = NI of 1 (So for every 1000 people in Japan, each year the population goes down by 1) Japan has a population of 127m So what is their annual population change? -127,000

Bangladesh BR = 21 DR = 6 NI = ? NI = +15 (per 1000 people) Bangladesh has a population of 156 million. What will their annual growth be? million

But Wait???? Is Bangladesh more developed than Japan? How can it have a lower death rate? Death Rate = Number of deaths per 1000 of the population Clue – Bangladesh life expectancy = 70 (IMR 33) Japan life expectancy = 88 (IMR 2) Due to Japan’s low birth rate and long life expectancy, Japan has an ageing population, so a much greater % of the population are old (and therefore nearer to death). In Bangladesh most of the population are young so the % near to the likely death age is lower

pyramid pyramid