Human Population Growth is Calculated using Birth and Death Rates
Population Growth Rate (per 1000 people per year)=birth rate - death rate
- Human population size is constantly changing, this depends on birth and death rates
- Birth Rate - number of live births a year for every 1000 people in the population (10/1000 birth rate would mean 10 live births a year)
- Death Rate - number of people that die per year for every 1000 people in the population.
The Demographic Transition Model show trends in Human Populations
The demographic transition model (DTM) is a graph that shows changes in birth rate, death rate and total population size for a human population over a long amount of time, it has 5 stages:
- Birth and death rate fluctuate at a high level, population stays low
- Birth rate is high due to no birth control or family planning, education is poor.
- Lots of children die young (high infant mortality) so parents have more children so enough survive to work on farms and look after them .
- Death rate is high because there's poor health care sanitation and diet so there's lots of disease and starvation
- Death rate falls, birth rate stays high, population rapidly increases