The document discusses three ways a population can increase: 1) an increase in births, 2) a decrease in deaths, and 3) immigration exceeding emigration. It notes that the natural rate of population increase is calculated as the birth rate minus the death rate. It also mentions some impacts of population growth such as increased consumption of natural resources, pollution, and a changing distribution of populations across economic sectors.

1. Population

3. Calculate
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4. 1. 2.
Three ways 3.
of increase in Increase in Decrease in Immigration
population: number of number of >Emigration
birth. death.

5. The natural rate of
increase in a population
is the difference Birth rate - Death rate.
between the birth rate
and death rate.

21. Increased consumption of
scarce natural resources such
as trees, open space and
water…
Pollution…..

24. 3billion
40% in 21% in 39% in
agriculture secondary service