8.1 Human Population Dynamics

Crude Birth Rate (CBR)

The number of births per thousand individuals in a population per year

Crude Death Rate (CDR)

The number of deaths per thousand individuals in a population per year

Natural Increase Rate (NIR)

The rate of human growth expressed as a percentage change per year

Doubling Time (DT)

The time in years that it takes for the population to double in size

Total Fertiliy Rate (TFR)

The average number of children a woman would have during her reproductive years if she experienced the current age-specific fertility rates throughout her lifetime

What growth do humans increase at?

Exponential

What is said about human growth?

There’s a lot of uncertainty around it

When can there be a high projection of the world population?

CDR falls rapidly, CBR will fall very slowly

What happens for middle projections of world population?

Both CDR and CBR will fall

How to calculate CBR?

Number of births/population * 1000

How to calculate CDR?

Number of deaths/population * 1000

How to calculate NIR?

CBR - CDR

How to calculate population density?

Population / land area

How to calculate DT?

70/NIR