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Population Change is going to occur because of many reasons

1) theory in economics (Malthus Theory): when population increased to a large amount than any natural disaster occur to balanced it.

2) Bio theory (Natural Selection): with the new technologies habits of man are changing that results in change in birth/death rate, immunization etc.

3) Food habits are also changing: that causes less immunization and rapid spread of diseases.

4) Wars: as today's mass destructive weapons results in large reduction of population.

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