Causes of overpopulation

Define over-population for children
Important population terminology

Overpopulation Problems
Factors of overpopulation
Overpopulation and natural resources
Important overpopulation facts


Causes of overpopulation

Population is determined by three main factors: natality, mortality, and migration.

Lower Mortality Rate:
All over the world, improved access to health care, information and communication have resulted in people living longer. For example, the life expectancy in the USA was 68years in 1950. Today in 2018, the life expectancy in the US has increased to almost 80years.

Higher Natality:
Advancement in healthcare, pharmaceuticals, and information have combined to reduce the number of babies who die before, during and after birth. Access to immunization and improved child care have also helped to increase the chances of children surviving. For example, Approximately 1300 infants in the USA died in 1980 (1.3%) per 100,000. In 2014 the rate has reduced by half to approximately 600 infant deaths per 100,000 (0.6%)

Increased Migration:
Personal, economic, environmental and social factors force people to migrate to other places. In the last decade, international migration has been on the increase, mainly for economic reasons. One report indicates that about 10% of the population of developed countries is comprised of international migrants, who commonly migrate for economic reasons. By 2050, between 15 and 36 percent of the population of various countries in Western Europe is projected to be of “foreign origin.”

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2. Data for 1980-1999: Pastor, P.N., Makuc, D.M., Reuben, C., Xia, H. (2002). Health: United States: Chartbook on trends in the health of Americans. Hyattsville, Maryland: National Center for Health Statistics.
Available at: Data for 1999-2009 Centers for Disease Control and Prevention, National Center for Health Statistics. Underlying Cause of Death 1999-2013 on CDC WONDER Online Database. Available at:
Data for 2014: Kochanek, K. D., Murphy, S. L., Xu, J., & Tejada-Vera, B. (2016). Deaths: Final data for 2014. National Vital Statistics Reports, 65(4). Hyattsville, Maryland: National Center for Health
Statistics. Tables 3-4. Available at:
3. Population Action International., Why Population Matters to Migration AND Urbanization,


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