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Well, this may be caused by the lack of knowledge people has regarding this matter. 

people may engaged themselves in learning about family planning, the use of contraceptives and consider the future of the children before stepping up their relationship.

also even at a young age, things like that should be taught to them. 
like an article... how to resolve population growth... can you?:)
i'll try.
who can answer my question?
population growth, another problem to the economy, but why did it happen in the first place?
technically, it is with the lack of knowledge and decisions made without thinking twice. how will we refrain from enlarging our population?
the solution, discipline, people must have this within them, this will serve as their shield from temptations.