Chapter 17
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Transcript of Chapter 17
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Chapter 17Lessons From the Past, Lessons
For the Future
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Lessons from the Past & for the Future How Successful Are We? Humans are animals
Religious views Exploitation of resources Reproduction # of Species Longevity
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Impact of Humans Culture as an adaptive strategy Emergence of Agriculture. Increased sedentism.
Health & nutrition Infectious diseases
Where humans meant to live the lifestyles we live today?
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The Loss of Biodiversity What is biodiversity? Loss of biodiversity. Geological record: 15+ mass extinction over the past 570 million years.
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Mass Extinction Events
1st- 250 m.y.a.- climatic change-landmasses into one supercontinent.
2nd - 65 m.y.a. ended 150 million years of evolutionary processes that produced the dinosaurs. (impact of an asteroid).
3rd- Occurring now-large mammalian species-pushed toward extinction by humans (Pleistocene 10,000y.a.) In North America, at least 57 mammalian species
became extinct, including the mammoth, mastodon, giant ground sloth, saber-toothed cat, several large rodents, and numerous grazing animals
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Extinction Species disappearing
Reasons Rainforest deforestation
Contributes to global warming- absorption of carbon dioxide.
Burning trees as land is cleared- +carbon dioxide. An estimated 20% of all carbon dioxide
emissions are accounted for by the burning of the Amazon rain forest alone.
Could humans become extinct?
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Map of Deforestation
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Overpopulation Main problem facing humanity Reasons?
10,000 years ago-about 5 million people. By 1650- 500 million By 1800- 1 billion. Between 10,000 years ago and A.D. 1650
population size doubled 71 times. 50% are under 15 yrs. old
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Overpopulation Dates and associated population estimates
up to the present are as follows: mid-1800s, 1 billion 1930s, 2 billion mid-1960s, 3 billion mid-1980s, 4 billion present, 6 billion
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Line Graph Depicting Exponential Growth of Human Population
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The Greenhouse Effect And Global Warming Activities- produce waste and pollution-
environmental degradation. Energy for human activities is derived
from burning of fossil fuels. Burning fossil fuels releases carbon
dioxide into the atmosphere- traps heat. Effects of deforestation Results
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Global Warming Kyoto Protocol Since 1860- 1990s hottest decade. 2002 -the warmest year on record,1998
as second. 2003 in Europe- hottest on record.
temperature reached 100°F in London.
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Climate Change The average surface temperature of the earth
increased by 0.8 C (1.4F)between 1961 and 1990. (U.N. Intergovernmental Panel on Climate Change)
An increase in the mean annual temperature worldwide of 0.5–1°C(.9-1.8 F) could result in melting of the polar caps and flooding of coastal areas.
Experts believe Greenland’s ice sheet will disappear if temperatures increase 3.0°C (5.4 F). This could raise sea levels by as much as 23
feet over the next 1000 years.