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4 billionyear________6 billion year________8. Use your estimations from above to determine the doubling time:from 1 to 2 billion? __________from 2 to 4 billion? __________from 3 to 6 billion? __________9. Has a doubling of world population occurred in your parents’ lifetime? 10. Look at the chart of Population Growth in Selected Countries found below the previous data on the excel spreadsheet.. Fill out the chart in the following way:a)The Natural Increase is the % increase per year. To calculate it, subtract the death rate from the birth rate and divide by 10. b)Now calculate the doubling time by using the “Rule of 70”Doubling Time = 70/ Natural Increase 11. a) What country has the greatest rate of population growth?_________ What is the rate? _______% per yeara)What country is closest to zero population growth?_____________b)What is the doubling time for the United States?_________yearc)The birth rates and death rates that are given are per 1000 people in one year. The United States is actually growing faster than its natural increase. The United States, with its open immigration policy, accepts 5 immigrants per thousand each year. Add 5 to the birth rate to show the increase due to immigration. a.What is the doubling time?___________years. d)Check to see if the “Rule of 70” actually works. Look up the population and% increase for 1952 in the World Population and Annual Addition, 1950-2007 chart. population = ______________ annual addition = _____________Natural rate of Increase (%)=___________using the “Rule of 70” calculate the doubling time=_________What year should the population be double?__________ 31
According to the data chart, what was the population that year?_______________ Explain the reason for any difference. 12. Look at the data on the spreadsheet World Population Growth, 1950-2007. a. What year were you born?________ b. What was the population that year?________ c. What was the growth rate that year?_______Use the rule of 70 to determine the doubling time at the time of your birth d. doubling time = ___________ years. e. What year will that be___________?13. Make a graph of World Population Growth, 1950-2010. If you need help, ask your teacher how to make the graph. Add an exponential trendline.You want to project the trendline into the future a)Double click or highlight the trendline, and select ‘FORMAT TRENDLINE’. Select ‘FORECAST FORWARD’—type in 30.b)Does the trendline agree with your prediction in 12e?_________ Explain.14. Print your graph. 15. Do you think that the projected trendline accurately describes the future human population?______ Draw by handyour prediction of population growth from 2007 to the future on your graph, and explain below why it differs from the trendline generated by the computer. 16.Looking at the EXCEL worksheet of World Population growth, what is the annual addition of people during last year?__________million people.a)In 1918 an influenza (often called the Spanish Influenza) killed 21,000,000 people. At last year’s increase rate, how long would it take the world to recover from such a devastating epidemic? Hint: how many people were added last year?