Human Population Growth Chapter 4 (and Section 3.3). Dynamics of human population growth Human populations are like other pops. Natality factors Mortality factors Age structure Demographic transition Future human population. What is a population? (Chapter 3 – Section 3.3).
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Population growth (DN) is just Births - Deaths over time (Dt)But, Births & Deaths obviously depend on NSo to compare pops. of different sizes we use percapita Birth & Death rate (B & D, respectively)Then, we let B - D = r,And thus, for a given time (Dt), pop. growth is: DN = r • NDt
* November, 2012: World population passes 7 billion
—> inevitably outstrip food supply and resources —> poverty & social decline—> populations crash—> cycle repeats (usually in a new location)
China's one-child-per-family policy decreased the country's fertility rate from 6 to 1.8 in two decades. However, the policy was very controversial