Populationx2x - Population Population Characteristics over...

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Population
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Population Characteristics over Time For most of human history, population was fairly stable with growth rate of 0.002% per year. Advances in developed world changed that: 17th century advances in science, agriculture, and health practices 19th century Industrial Revolution Population quadrupled between 1750-1950 in developed world because of declining death rates Population doubled between 1950 – 1990: from 2.5 to 5 billion Transition period – lag time till birth rates decrease to balance out lower death rates.
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Human Population Growth Over Time
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Measures of population Numbers of births, deaths, immigration, emigration over a specified time period determines the changes in pop. size Changes are expressed numerically: DT: doubling time in years TFR: total fertility rate Rate of Natural Increase-expressed as %
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Growth and Total Fertility Rates Growth is slowing down globally Global TFR: 1950’s – 5.0 1990’s – 2.7 Between 1970-1995: Asia TFR: 5.7 2.6 Africa TFR: 6.6 5.1 Latin America/Caribbean TFR: 5.0 2.7
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However, globally rate of increase is still at 90 million people each year. At what number will our population finally stabilize??
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Demographic Factors Influencing Demand for Food Age Structure : reflection of the underlying demographic conditions of the preceding decades and at the same time is an important determinant of future demographic patterns.
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Population Pyramids A convenient way to visualize the age structure and the sex of the population
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