Growth and Changing Growth and Changing NeedsNeeds

Measuring Growth RateMeasuring Growth Rate

Helpful for scientists, urban Helpful for scientists, urban planners and others who have to planners and others who have to anticipate the future populationanticipate the future population

Determined by subtracting Determined by subtracting Death rate (number of deaths Death rate (number of deaths per 1000 people from the birth per 1000 people from the birth rate (number of births per 1000 rate (number of births per 1000 peoplepeople

Measure the Growth Rate Measure the Growth Rate of the following:of the following: Birth rate= 29 births/1000 peopleBirth rate= 29 births/1000 people Death rate= 8 deaths/1000 Death rate= 8 deaths/1000

peoplepeople

29 – 8= 21 29 – 8= 21

The population grew at a rate of The population grew at a rate of 21 persons per year per 1000 21 persons per year per 1000

people OR 2.1%people OR 2.1%

Doubling TimeDoubling Time

How long it will take a particular How long it will take a particular population to double its sizepopulation to double its size

Illustrates negative potential of Illustrates negative potential of uncontrolled population growthuncontrolled population growth– Double housing, food supplies, Double housing, food supplies,

jobs, education, water, energy, jobs, education, water, energy, health facilitieshealth facilities

– Try to maintain or improve Try to maintain or improve standard of livingstandard of living

Factors that determine growth Factors that determine growth raterate

Birth and death rateBirth and death rate Immigration- people moving into an areaImmigration- people moving into an area Emigration- people moving out of an Emigration- people moving out of an

areaarea

* Immigration and emigration only factor * Immigration and emigration only factor in when studying population of a specific in when studying population of a specific area (city, nation), not the worldwide area (city, nation), not the worldwide popoulation.popoulation.

DemographyDemography

Does not only look at numbers but Does not only look at numbers but also the types of people that make also the types of people that make up a certain populationup a certain population

Can determine how the populations Can determine how the populations changing- older, richer, better changing- older, richer, better educated?educated?

Can help make plans to Can help make plans to accommodate the future needs of accommodate the future needs of societysociety– Child care, care for the elderlyChild care, care for the elderly

Which one has a faster Which one has a faster growth rate? How can you growth rate? How can you

telltell??

Changing NeedsChanging Needs TechnologyTechnology LifestylesLifestyles Standards of livingStandards of living

All of these change consumption All of these change consumption rates of a populationrates of a population

Ex: energy use- increased use due Ex: energy use- increased use due to industrialization and to industrialization and

modernizationmodernization

1.1. Why is knowing the rate of population Why is knowing the rate of population growth important?growth important?

2.2. Who might use this information?Who might use this information?3.3. How are population growths How are population growths

determined?determined?4.4. What is meant by the doubling time of a What is meant by the doubling time of a

population?population?5.5. Other than birth and death rates, what Other than birth and death rates, what

other factors can affect the doubling other factors can affect the doubling time of a population?time of a population?

6.6. What is demography?What is demography?7.7. Why do you think industrialized nations Why do you think industrialized nations

generally use more resources than generally use more resources than developing nations?developing nations?