Unit 1.2 – Changing populations & places

How has the population of the world been changing?

Why has the population been changing?

Populations change because of:

A – Migration

B – Natural increase/decrease

For the world change is due to natural increase/decrease only.

Birth rate

The number of live births per 1000 people living in a place per year. Sometimes expressed as a %.

Death rate

The number of deaths per 1000 people living in a place per year

Natural increase/decrease

The net change in the total population of an area due to the difference between the number of births and deaths.

Measured using: Birth Rate – Death Rate and usually expressed per 1000 people.

Factors influencing Birth & Death Rates

How do changes in birth and death rates over time cause populations to change?

The Demographic Transition Model (DTM)

Can the DTM be applied spatially?

Birth rates for countries (CIA)

Death rates for countries (CIA)

 

What is happening to fertility rates and life expectancy around the world?

The Fertility rate refers to the number of children a woman is expected to have during her lifetime, based on current birth rates.

Life expectancy is the number of years that the average person, born in a given place may expect to live.

Video – Hans Rosling: The best stats you’ve ever seen

What is population structure?

Population structure refers to how the population in a given place is made up in terms of the gender and ages of the people who live there. It is usually shown in the form of a chart called an age-sex pyramid or population pyramid.

populationpyramid.net displays population structures.

Dependency ratios

 

Consequences of megacity growth

 

Causes & consequences of forced migrations and internal displacement

Forced migration & internal displacement – Intro PowerPoint

therefugeeproject.org

Internal Displacement Monitoring Centre website 

Example – The case of Diego Garcia, Chagos Archipelago.

Wikipedia – Diego Garcia