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University of Toronto Scarborough
Environmental Science
Carl Mitchell

Chapter Six: Human Population HUMAN POPULATION: APPROACHING 7 BILLION Most of population growth comes from poverty nations o China and India are worlds most populous nations Although rate of global growth is slowing, we are still increasing in absolute numbers The human population is growing nearly as fast as ever: Exponential growth is the increase in a quantity by a fixed percentage per unit time o (given percentage of a large number is a greater quantity THAN the same percentage of a small number) o Therefore, even if growth rate remains steady, population size will increase by greater increments with each successive generation Doubling time (70 annual percentage growth rate) Perspectives on human population have changed over time: Thomas Malthus o Claimed that unless population growth was limited by laws or other social controls, the number of people would outgrow the available food supply until starvation, war, or disease arose and reduced the population o His work An Essay on the Principle of Population argued that a growing population would eventually be checked either by limits on births or increases in deaths If limits on birth were not implemented soon enough, deaths would increase www.notesolution.com
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