Chapter Six - Lecture 2 - Human Population

Chapter Six - Lecture 2 - Human Population - Chapter 6...

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Chapter 6 Human Population: Approaching 7 Billion Nation population continue to grow, we are at 6.7 billion o China working to slow population growth o The rate of global growth is slowing The Human Population is growing nearly as fast as ever Population increases as a quantity by a fixed percentage per unit time, like a compound interest accrues in a savings account. o A given percentage of a larger number is > than an equal percentage for a small number Population growth hasn’t remained steady o Vary greatly from region to region China instituted its one child population, as its growth was 2.8% o 2.8% = 25 years doubling time of population. Perspectives on human population have changed over time In the 1700s population growth was regarded as a good thing o Parents thought of a high birth rate as more children to support them at an old age o For society, it meant a greater pool of labour for factory work. Malthus (british economist) said the population growth had to be limited by laws or social controls or the number of people would outgrow the food supply until starvation, war, or disease arose and reduced it. o Published essay on the principle of population Is population growth really ‘problem’ today? The ongoing population growth has been made possible by technological innovations, improved sanitation, better medical care, increased agricultural output, and other factors that have led to a decline in death rates, particularly a drop in rates of infant mortality. o Enormous increases in crop yields and advances in agricultural technology associated with the Green Revolution Births have outpaced deaths for many years now o Creating population problem. Cornucopian thinkers believe we can find a way to replace depleted resources. Not all resources can be replaced or reinvented once they have been depleted o Once species is extinct it is gone. o We can’t expand earth like a balloon. Resource availability must keep pace with population growth o Otherwise in the future each person will have less space to live, eat and material wealth In todays world population growth is strongly correlated with poverty than with wealth. Outside of Europe 56% of national governments feel their birth rates are too high, and only 8% feel they are too low o In Europe 3 of every 5 European national governments say their birth rates are too low Global population growth and resulting environmental scarcity have played a central role Population is one of several factors that effect the environment
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Chapter 6 IPAT Model o I=PxAxT Impact (I) Impact is thought of in various ways o Pollution or resource consumption Population (P) Increased population means more individuals take up space, use natural resources and generate waste Affluence (A) Increased affluence magnifies environmental impact through the greater per capita resource consumption that generally has
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This note was uploaded on 02/29/2012 for the course ENVIRONMEN eesa01 taught by Professor Mitchel during the Fall '11 term at University of Toronto.

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Chapter Six - Lecture 2 - Human Population - Chapter 6...

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