Chapter 13 Population and Food For most of the past 200 years, world population rose hardly at all. There were only 300 million at the time of Christ. Demography ? Picture of the people Demographic Concepts: Fertility is the incidence of childbearing in a population Live births/Total Population X 1000 = Crude Birth Rate. Mortality is the incidence of death in a population. Deaths/Total Population X 1000 = Crude Death Rate Infant Mortality: Number of Infant Deaths X 1000 Number of Live Births Migration ? refers to the movement of people into or out of a given area. Doubling Time ? number of years it takes for a population to double at a given rate 70/rate of growth. Thomas Malthus ? Gloomy prophet, Pessimistic preacher, dark An Essay on the Principle of Population (1798) Pop. Rises exponentially Food rises arithmetically Eventually we have more people than we can feed Resulting in famine, war, pestilence and death That will drive population levels back down to sustainable levels The Wealth of Nations ? Adam Smith (1776) Origin of Species ? Charles Darwin (1859) Neo-Malthusian and Exponential increase If growth doubles during approximately equal intervals of time, it suddenly accelerates.
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