Overpopulation is Earth's biggest problem that needs to be solved. At a surprising rate, the world's population has grown exponentially, and in over a hundred years it will reach 12 billion people. Regarding this population growth, many factors must be taken into account, such as cultural influences and illiteracy. Solutions may be available, but do you think the solution you have chosen is best for you based on your preferences. As a result, we are now faced with both a question and a choice: "What do you think is the best solution to overpopulation and will you stick to moral teachings or follow what the experts? » Overpopulation remains the greatest and most significant. The most difficult problem to solve because of the future consequences it could cause, such as the lack of resources to feed the population. The current population increase dates back to the Stone Age to the era of industrialization (Penfound, 1968). The population before Christ took 40,000 years to double with a growth rate of 2%. In 1850, the human population was one billion, then increased to two billion just eighty years later, in 1930. Three decades later, in 1960, it reached three billion, and in 1975 it reached four billion inhabitants (Howard, 1969). Paul R. Ehrlich, author of the book "The Population Bomb" said in 1992 that Earth will face "the need to support at least twice its current human population, whether due to uncertainty of the sustainability of Earth's livelihood systems” (Daily and Ehrlich, 1992). He also projected that by 2025, Earth's population will reach 8.5 billion, and will ultimately stabilize at 11.6 billion in 2150, based on "positive assumptions of continuity." .... middle of paper ......, G. (November 1961). Birth Control in Britain, Part II. Population Studies, 15 (2), 121-160. Retrieved from http://www.jstor.org/stable/2173312. Penfound, W.T. (May 1968). Overpopulation problems. Bios, 39 (2), 56-62. Retrieved from http://www.jstor.org/stable/4606831. Ryder, R.E.J. (1993). Natural Family Planning: Effective birth control supported by the Catholic Church. British Medical Journal 307, 723-6. Retrieved from: http://www.jstor.org/stable/29721085. Schultz, T.P. An economic model for family planning and fertility. Journal of Political Economy, 77 (2), 153-180. Retrieved from http://www.jstor.org/stable/1829763. VandeVusse, L., Hanson, L., Fehring, F., Newman, A., & Fox, J. (2004). The couple's perspective on the effects of natural family planning on marital dynamics. Journal of Nursing Scholarship 35 (2), 1-13.doi: 10.1111/j. .1547-5069.2003.00171.