Birth Rate
Number of babies born per 1000 people in a population each year
Death rate
Number of people who die per 1000 members of a population each year
How do you calculate world population growth?
Birth rate - death rate
Natural Change
The balance between births and deaths in any year
Why does world population grow?
The birth rate is higher than the death rate
Natural increase
When the birth rate exceeds the death rate
Natural decrease
When the death rate exceeds the birth rate
What was the world’s population in 1700?
750 million people
What was the world’s population in 2000?
6 billion
What is the world’s current population?
8 billion
When did the world population explosion happen?
After 1750
Overpopulation
Where there are too many people to be supported to a satisfactory level by the resources available.
Under population
Where there are too few people to make the most of the resources available.
Optimum population
The resources available can be used effectively and people can have a good standard of living.
Resources aren’t under-used or over-exploited.