Population Dynamics [Notes]
In 1990, the population of the world had reached 5.3 billion
people. In 1998 this population was now 6.06 billion. This population was unequally divided between the 33 more developed
countries (MDC'S) and the 150 less developed countries (LDC's).
Population growth for the planet is related to only two factors:Population increase (or decrease) equals
net birth rate minus net death rate.
In 1990, the birth rate for the world was 27 live births/1000 persons.
The death rate was 9 deaths/1000. This represents a growth rate
of 1.8% (27-9)/10 = 18/10 = 1.8. Comparable 1996 rates are
a little better with a growth rate of 1.55%.
This represents an increase:
| 1981|| 1985|| 1991|| 1994|
|per day || 205,000|| 221,000|| 260,000 || 245,500|
|per week || 1,400,000|| 1,550,000|| 1,800,000 || 1,723,000|
|per year ||75,000,000|| 81,000,000|| 95,000,000 || 89,600,000|
Until very recently, population increase has been more the
result of a DECREASE IN DEATH RATE than in changes in
other factors. Prior to 1940, the birth rate only
slightly exceeded the the death rate. Major changes
came about with three events:
introduction of Penicillin,
introduction of Streptomycin
and development of DDT.
MAJOR FACTORS AFFECTING HUMAN POPULATION SIZE
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