Demographers typically focus on three dimensions— fertility, mortality, and migration —when examining population trends. Yes they’re natural 20 d20 dice funny RPG gamer shirt. Population’s Structure: Fertility, Mortality and Migration. You might imagine Malthus’ scenario on geometric population growth as being like compound interest : A couple have two children and those children each produce two children.
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As Rob Kunzig wrote for National Geographic, the new study estimates that “there’s an 80 percent chance that the actual number of people in 2100 will be somewhere between 9.6 and 12.3 billion.” That is a reversal from estimates done five years ago, when demographers—people who study population trends—were projecting that by 2045, world population likely would reach about 9 billion and begin to level off soon after. The new UN study out this week projects that the world’s population growth may not stop any time soon.
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