Explain the three components of population change in the world. Analyse the impacts of population change.

The three components of population change are:

 (i) Births

 (ii) Deaths

 (iii) Migration

The impacts of population change:

 (i) Population growth beyond a certain level leads to problems. Of these the depletion of resources is the most serious.

 (ii) Population decline is also a matter of concern. It indicates that resources that had supported a population earlier are now insufficient to maintain the population.

 (iii) The deadly HIV/AIDS epidemics in Africa and some parts of the Commonwealth of Independent States (CIS) and Asia have pushed up death rates and reduced average life expectancy. This has slowed down population growth.