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How has the world’s population changed over time?

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How has the world’s population changed over time?

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  1. 3.1 Population (use this ppt and the double-sided population worksheet) use your testbook too!You need to know: 3.1.1: Exponential growth3.1.2: Population change and how to measure these things CBR CDR Fertility Doubling time Natural increase3.1.3: The DTM and population pyramids

  2. How has the world’s population changed over time? Draw a very quick line graph to show this information. How many years did it take the world’s population to increase from 1 billion to 2 billion? 123 years 2 billion to 3 billion? 33 years 3 billion to 4 billion? 14 years 4 billion to 5 billion? 13 years 5 billion to 6 billion? 12 years 6 billion to 7 billion? 12 years What is your estimate for the number of years to increase from 7 billion to 8 billion? 12 years What was the doubling time for 1 to 2 billion and 2 to 4 billion?

  3. 9. What evidence is there in the graph above that the world’s population growth may slow down? The evidence is that at the very top the red part starts to curve instead of go straight up which means that the population will start to even out and maybe in the far future, decrease and the time to add a billion increases to 26 yrs from 8 to 9 billion people.

  4. 10. In which 50 years did most growth take place? 1950 - 200011. Is most of the growth in MEDCs or LEDCs? LEDCs12. True/false: The rate of population growth has been increasing with time.

  5. Why has there been a population explosion? There has been a population explosion which mainly took place at the turn of the industrial revolution, when technology was improved, new medicine was discovered as well as other things like improved health conditions. This meant children survived rather than dying in infancy. It also meant people lived to be much older and so these two things contributed to a population increase.

  6. The Philippines: population information

  7. Big understanding: What are the population issues facing The Philippines? (8 marks) The population issues the Philippines is mainly facing is the fact that the poorer people of the Philippines which is a very large portion of the nation’s population, are having many kids not realizing the consequences of their actions until it’s too late. The Philippines doesn’t have the money or really the government doesn’t find it necessary to try and solve this issue, even issuing a RH Bill which is against contraception which is one of the important things the Philippines needs in order to slow down the rapid growth in population of the Philippines. As well, with a rapidly growing population the resources of the Philippines is dwindling, it will be impossible for them to sustain everyone in the country, even at the point they are in now 33% of the population is below the poverty line having families the size of a soccer team who they cannot provide for because they either don’t have well paying jobs or they don’t have a job at all due to the lack of education.

  8. The Philippines: sex and religion • Manila is fast growing / slow growing. • What products can be bought at the stall? What are they used for? • How many illegal abortions take place each year? • What is one side effect of these abortions? • Why do people blame the church for The Philippines’ population growth? • Are contraceptives given out by public health clinics? • Out of all the pregnant women in Manila, what proportion of the women wanted to get pregnant? • How large is the family in the film? What are the knock-on effects of this large family size on living space, poverty and education? • What is the RH bill? • Why is their a debate about it? • What reasons were given for having a large population? • What are your reasons slowing down the population growth?

  9. 1. fast growing • 2. catholic icons, amulets, lucky charms, regala (abortion drink = illegal) • 3. Half and million • 4. 8000 women died from abortion • 5. Because they have • 6. Banned from administering contraceptives • 7. Half of the pregnancies are unplanned • 8. 11 children in the family, not all kids can go to school, 7 of the kids have to work. • 9. It's a bill for contraceptives, for sex education, for abortion. • 10. Because there are so many things on one bill and some are debatable such as abortion and contraceptives. • 11. The more people in the country the better the economy, more people to work. • 12. I would like the growth to slow down because the Philippines isn’t capable of holding that many people who are in poverty who are the main reason for the population growth.

  10. DTM

  11. STAGE 1: Zambia

  12. STAGE 2: Egypt

  13. STAGE 3: Brazil

  14. STAGE 4: Japan

  15. STAGE 5: Germany

  16. Doubling time • The number of years it would take a population to double its size at its current growth rate. • A natural increase of 1% will allow a population to double in 70 years. • Other doubling times can be calculated proportionally i.e: Doubling time = 70 natural increase rate

  17. Fertility The potential for reproduction exhibited in a population: • Fertility Rate - the no. of births per 1000 women of child bearing age. • Total Fertility – the average number of children a woman has in her life-time

  18. Natural Increase rate (%)= crude birth rate – crude death rate 10

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