how human activities impact the earth's ecosystems ii
DESCRIPTION
How human activities impact the Earth's ecosystems II. http://ian.umces.edu/blog/2013/02/12/managing-for-sustainable-ecosystems-our-human-role/. Bell ringer activity. Have you heard of the ozone layer? Write down what you think causes the ozone layer depletion. - PowerPoint PPT PresentationTRANSCRIPT
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How human activities im-pact the Earth's ecosys-
tems II
http://ian.umces.edu/blog/2013/02/12/managing-for-sustainable-ecosystems-our-hu-man-role/
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Bell ringer activity • Have you heard of the ozone layer?Write down what you think causes the
ozone layer depletion.chemicals :chlorofluorocarbon (CFC)
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4. Ozone layer depletion
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4. Ozone layer depletion con’t• The ozone layer protects people from
UV light. (Especially, UVB light)
http://www.epa.gov/ozone/science/q_a.htmlhttp://www.epa.gov/ozone/science/sc_fact.html
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4. Ozone layer depletion con’t
• Ozone
-Blue-Has a strong odor.
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• Chlorofluorocarbons (CFCs) are chemicals that were used in aerosol cans, refrigerators, etc. • When CFCs and other pollutants are
broken down by UV light, they dam-age the ozone layer.
4. Ozone layer depletion con’t
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• Ozone hole over Antarctica • More UVB light can causeskin cancer and other harmful effects onsome organisms.
4. Ozone layer depletion con’t
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4. Ozone layer depletion con’t
• Many countries banned or reduced the production of CFCs.
• The ozone layer will be recovered in about 50 years.
http://www.epa.gov/ozone/science/sc_fact.html
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Video: ozone layer depletion (Fill out the handout.)
• http://www.youtube.com/watch?v=6QyI3Yo1sf4
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5. Energy consumption
http://www.eia.gov/forecasts/ieo/world.cfm 1 Btu = 1055 joules
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5. Energy consumption con’t
http://www.eia.gov/forecasts/ieo/world.cfm
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5. Energy consumption: fossil fuelsPositive effects of fossil fuels
Negative effects of fossil fuels
-have provided people with energy
-have been relatively cheap
-Pollution: burning fossil fuels produces carbon dioxide and causes global warming and acid rain.-Fossil fuels are limited, and the prices will go up in the future.
(Thaddeus, 2010)
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Possible solutions to the problems with fossil fuels
•Nuclear energy •Renewable energy
-Solar energy -wind energy-Geothermal-Bioethanol
•Reducing energy consumption, etc.
–(Thaddeus, 2010)
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Possible solutions to the problems with fossil fuels
• All the possible alternate energy sources have advantages and disad-vantages.
• More countries try to switch to alter-native energy sources.
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Fuel Mix for U.S. Electricity Generation
http://www.epa.gov/cleanenergy/energy-and-you/index.html
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Video: Japan’s wind power• http://www.cnn.com/video/?/video/wo
rld/2013/03/11/zolbert-japan-wind-power.cnn
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Group activity • Work in groups of four.• Write down every vocabulary word
we have learned in this unit: one word on each sticky note.
• Make a big concept map using the words.
• Each group will present its concept map.
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Exit ticket
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Exit ticket 2