9) The whole world will reach its' replacement fertility by 2030, but that is a long way ahead since babies today will grow and bear children of their own therefore increasing the number of population.
8) Women who are educated start having babies later than those who aren't, especially in India where people have children when very young and number of children indicates their social statuses.
7) When fertility had fallen close to replacement number, the rate of birth since the older times sky rocket, we call this Baby Boomer! People assume that the cause of this was women's instinct to have enough babies for the survival of species.
6) Number of birth before and now (even though the number had decreased) will not balance out the world's population, since it would take generations for the fewer productions to take effect on the number of people.
5) Advancement of medicine (such as vaccination, cure to diseases, antibiotic) and sanitation doubles the expectancy of life in many countries. People found cures to diseases and are basically saved from dying.
4) People must make use of their resources carefully and not over whelming to save the people from environmental challenges. For example finding alternatives source of energy.
3) People's ways of consuming resources is the actual impact that takes place on the population, not the number of people.
2) People are growing exponentially, faster than the growth of food supply. (Thomas Malthus)
1) The number of population and the conditions of civilization will depend on choices individuals make throughout their lives.
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