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.
The number of live births per 1000 people living in a place per year. Sometimes expressed as a %.
The number of deaths per 1000 people living in a place per year
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.
How do changes in birth and death rates over time cause populations to change?
Can the DTM be applied spatially?
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.
Fertility rates in South Korea are now <1. This has serious implications for the country.
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.
Consequences of megacity growth