How and why do rates of population change vary over time?

Populations change as result of variations in the BR and DR, plus/minus migration. The DEMOGRAPHIC TRANSITION MODEL describes how BR and DR change over time. It was developed from a study in England & Wales and Sweden. It has since been applied universally.

DTM Ukraine

DTM Kenya – Which Stage?

DTM Italy – Which Stage?

YEAR

Millions of people6000

0

3000

4000

5000

2000

1000

20001100

Slow growth

1650

Increase in growth

1820

1930

EXPLOSION

1960

1974

1987

POPULATION EXPLOSION?

Mr and Mrs Mroue go to a family planning clinic for the first time

Abdu Ahmad loses his job as a gravedigger

Children feel cosier in bed at night because they have more brothers and sisters

Somebody has started an aerobics class for the over 70s

A lot more houses are being built

Mrs Ezzedine cries over the grave of her son, the third of her children that has died in a typhoid epidemic

Few children have grandparents

People are encouraged to look for work overseas

The public health inspector smiles as the building of the new sewers is finished

Fewer children share a bedroom