aim: how have humans impacted the earth?
DESCRIPTION
AIM: HOW HAVE HUMANS IMPACTED THE EARTH?. DO NOW: Approximately, how long have humans been on Earth according to the fossil record. 4.4 million years. World 6,785,186,332 12:15 GMT (EST+5) Jun 08, 2009. U.S. 306,617,138. JUNE 2008 - PowerPoint PPT PresentationTRANSCRIPT
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JUNE 2008One birth every.................................. 7 seconds One death every.................................. 13 seconds One international migrant (net) every............ 29 seconds Net gain of one person every..................... 10 seconds
World 6,785,186,332
12:15 GMT (EST+5) Jun 08, 2009
U.S. 306,617,138
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Human population growth is the root of many environmental issues.
•Overuse of non-renewable resources
•Destruction of habitats
•Deforestation
•Pollution
•Atmospheric changes
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Increased industrialization demands more resources and energy use.
This has positive and negative effects on humans and ecosystems
Industrialization
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Eutrophication is caused by enrichment of the aquatic biomes from fertilizers and wastes. (too much of a good thing)
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Eutrophic Lake
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•reduces the content of water in the soil and groundwater as well as atmospheric moisture•reduces soil cohesion, so that erosion, flooding and landslides often ensue. •reduces biodiversity •reduces possible medicinal advances•Adds to global warming
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Soil, Thermal, Noise, LightSoil, Thermal, Noise, Light
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Acid Precipitation is caused mainly by combustion of fossil fuels.
Acid rain cause the rapid erosion of statues and destruction of lakes
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Average pH profiles in U.S. in 1999
Why is the eastern U.S. so high in acid rain? Air Pollution
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PART II
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DO NOW:Which animal has modified
ecosystems more than any other animal and has had the greatest
negative impact on world ecosystems?
1. gypsy moth 2. zebra mussel 3. human 4. shark
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A major reason that humans have negatively affected the environment in
the past is that humans have
1. frequently lacked an understanding of how their activities affect the environment
2. passed laws to protect certain wetlands 3. attempted to control their population
growth 4. discontinued the use of certain chemicals
used to control insects
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Green House Effect: Climatic change caused by increasing Greenhouse Gases
(carbon dioxide)
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Which factor is a major cause of global warming?
1. increased burning of fuels 2. increased number of green plants 3. decreased mineral availability 4. decreased carbon dioxide in the atmosphere
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Introduced Species: species from another ecosystem is a problem because there usually
aren’t natural checks May reduce Biodiversity!
Nile perch (Lake Victoria) Brown tree snake (Guam)
Argentine ants Caulerpa (seaweed)
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Zebra Mussels in the Great LakesHas reduced Biodiversity!
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Imported animal species often disrupt an ecosystem because in their new environment, they will most likely
1. eliminate the genetic variation of the autotrophs
2. increase the number of mutations in the herbivores
3. have no natural enemies 4. be unable to produce offspring
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The importation of organisms such as the Japanese beetle and gypsy moth to areas where they have no natural
enemies best illustrates1. the use of abiotic factors to reduce pest
species 2. the selection of species to mate with each
other to produce a new variety 3. attempts by humans to protect extinct
species 4. a human activity that disrupts existing
ecosystems
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African elephant tusks consist of high-quality ivory. In recent years, the
elephant population in certain African wildlife preserves has decreased. This
decrease is most likely due to
1. air pollution 2. human exploitation 3. biocide use 4. importation of Japanese beetles
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Trade-offs:
solving environmental issues involves trade-offs. There are
always costs associated with social decisions.
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Solar Energy reduces dependence on fossil fuel but it is expensive.
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Nuclear Power provides electricity without fossil fuel but generates nuclear wastes.
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Societies must decide on proposals and assess risks, costs, benefits and trade-offs.
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SUMMARY
Which situation has had the most negative effect on the ecosystems of Earth?
1. use of air pollution controls 2. use of natural predators to control insect
pests 3. recycling glass, plastic, and metals 4. increasing human population
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