Term Definition
demography the scientific study of population characteristics
overpopulation when the number of people exceeds the capacity of the environment to support human life
ecumene the portion of Earth's surface occupied by permanent human settlement
CBR the total number of live births in a year for every 1,000 people alive in the society
CDR the total number of deaths in a year for every 1,000 people alive in the society
NIR the percentage by which a population grows in a year
TFR the average number of children a woman will have throughout her childbearing years (15-49)
IMR the number of deaths of infants under a year old (1) per 1,000 live births
life expectancy the average number of years an individual is expected to live given current social, economic, and medical conditions
doubling time the number of years needed to double s population, assuming a constant rate of natural increase (NIR)
regions w/ most doubling time, TFR & NIR growth Africa & Southwest Asia
highest life expectancy compared to LDCs Europe, Canada, Austria
highest CBR because of high NIR sub-Saharan Africa
stage 1 (low growth) • high & variable CDR (fluctuating mid 30s – mid 40s)•high & variable CBR(mid 30s – mid 40s)*uncertain food supplies/lack of medical techno.•low & variable NIR (fluctuating near zero)•stable & relatively low population*NO COUNTRIES, ONLY CITIES
stage 1 1. most of humanity's history on Earth has occurred during this stage, humans survived by hunting and gathering2. despite advent of the Agricultural Revolution c. 8000 BCE, human populations stayed in this stage bc crops yields were unstable
stage 2 (high growth) •CDR declines steeply (often into the teens)•CBR remains high & stable (often in the 40s)•NIR increases steeply often as high as 3%•population begins to skyrocket
Population & D.T. AP Population & D.T. APHUG

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