Lecture 22-Human Probems.post

Lecture 22-Human Probems.post - Human Population Growth...

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Human Population Growth, Resources, and Sustainability Elements of Ecology: Chapter 27
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Human population growth is directly related to environmental problems! http://www.brighton.ac.uk/ssm/courses/postgraduate/tourism/crowded%20beach.jpg
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Human population growth is directly related to environmental problems More people use more resources More people want a better way of life = more resources Greater resource use = more pressure on the environment
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Human population growth is directly related to environmental problems Land use: competition between agriculture and natural areas Water diversion Pollution Resource use: plant and animal products/trade
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Exponential and Logistic Growth
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World Population Milestones World Population reached: 1 billion in 1804 2 billion in 1927 (123 years later) 3 billion in 1960 (33 years later) 4 billion in 1974 (14 years later) 5 billion in 1987 (13 years later) 6 billion in 1999 (12 years later) World Population may reach: 7 billion in 2013 (14 years later) 8 billion in 2028 (15 years later) 9 billion in 2054 (26 years later) 10 billion in 2183 (129 years later) Source: United Nations Population Division. http://images.google.com/imgres?imgurl=http://www.eoearth.org/upload/thumb/8/83/Figure_1_long-term_population_growth.JPG/300px-Figure_1_long- GW7toUBsErSnFM:&tbnh=84&tbnw=116&prev=/images%3Fq%3Dhuman%2Bpopulation%2Bgrowth%26hl%3Den%26sa%3DX%26um%3D1
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Factors Affecting Human Population Size Population change = (Births + Immigration) – (Deaths + Emigration)
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Factors Affecting Birth Rates and Fertility Rates Cost of children Child labor (value) Urbanization Demographic transition Depression End of World War II Baby boom Baby bust Echo baby boom
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Factors Affecting Birth Rates and Fertility Rates Opportunities for women Old age care Age structure and sex ratio of population Infant mortality rate Age of marriage Availability of contraception/family planning/abortion Religious beliefs and cultural norms
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Factors Affecting Death Rate Infant mortality rates Life expectancy Disease
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Migration Environmental refugees Reducing births (contraception) Reduce poverty Empowerment of women Economic rewards and penalties Additional Factors Influencing Overall Human Population Size
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Demographic Transition Model http://www.geographyalltheway.com/igcse_geography/population_settlement/population/imagesetc/demographic_transition_living.jpg
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Environmental Effects of Food Production Habitat loss Soil loss (erosion) Biodiversity loss Air pollution Persistent organic chemicals (POPs) and bioaccumulation Water use issues (diversion, pollution) Human health issues
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Environmental Effects of Food Production http://images.google.com/imgres?imgurl=https://cac-ib-geography.wikispaces.com/file/view/Picture_2.png&imgrefurl=https://cac-ib-
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Lecture 22-Human Probems.post - Human Population Growth...

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