the polar ice caps created by diane mcdonough march 2012
TRANSCRIPT
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The Polar Ice Caps
Created by Diane McDonoughMarch 2012
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What is happening to the polar ice caps?
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Since 1979, the size of the summer polar ice cap
has shrunk more than 20 percent.
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Why are the ice caps shrinking?
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MELTING
The polar ice caps are undergoing a physical change.
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MELTING
is a change in state from a solid to a liquid.
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MELTINGoccurs when the the water molecules gain enough thermal energy………..
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Causing them to vibrate faster which
raises their temperature.
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Eventually the water molecules
Break free from their position in the the ice crystals.
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The overall sea water level rises.
Walruses, seals, and polar bears are affected by the loss of the ice caps.
As a result the ice caps shrink.
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The melting of the ice caps
is affecting my family.
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The ice is freezing later in the fall and melting earlier in the spring
This shortens our hunting season.
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Where is all the food?
The average bear’s weight has dropped 15%
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Where will we go for food?
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We have to swim to larger sea ice to hunt.
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Which is further off the shore.
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Many are unable to make the swim,
Especially the cubs.
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Our population is declining!
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Why is this happening to our home?
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GLOBAL WARMING
The melting of the ice caps is caused by
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Causes of GLOBAL WARMING
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CAUSES OF GLOBAL WARMING
• Depletion of the ozone layer
• Production of greenhouse gases: carbon dioxide, methane, and nitrous oxide
Include the following chemical reactions
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CHEMICAL REACTIONS
Occur when one substance breaks down into two or more substances
Two or more substances combine, forming one or more new substances.
OR
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The Ozone Layer is a layer in the Earth’s atmosphere
that protects the Earth from the sun’s harmful ultra-violet rays.
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Occurs because of a Chemical Reactions involving Chlorofluorocarbons
OZONE DEPLETION
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The chemical reaction involved…….
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Then…….
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Finally……
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Chemical reactions also produce greenhouse gases
That trap heat in Earth’s atmosphere
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Sources of greenhouse gas
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1.Fossil fuel2.Trees and Wood products3.Solid waste
Carbon dioxide is produced through combustion of
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The chemical reaction for burning wood is
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Methane is produced
• During the production and transport of coal, natural gas, and oil
• From livestock and other agricultural practices
• By the decay of organic waste in landfills
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CO2 + 4H2 = CH4 + 2H2O
Landfill Chemical Reaction:
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LIVESTOCK
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• During agricultural and industrial activities• Combustion of fossil fuel
Nitrous oxide is produced
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HOW CAN YOU CHANGE THE WORLD?
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Stop using or reduce the use of ozone depleting chemicals
Chlorofluorocarbons, halons, methyl bromide
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Plant a tree
Carbon dioxide is also removed from the atmosphere (or “sequestered”) when it is absorbed by plants as part of the biological carbon cycle.
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Ride a bike, walk, or take public transportation
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Drive a hybrid or more fuel efficient car
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Use alternative energy sources
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Use ENERGY STAR appliances and light bulbs
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Turn off lights and appliances
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Be part of the solution!
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Presented in this content trailer is one of the theories on Global Warming.
The other theory viewed by scientists is that Global Warming is a natural phenomena that has occurred in cycles throughout Earth’s history.
Global Warming Theories
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NASA Data Reveals 'Average' Ozone Hole in 2007
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Music:
John Mayer: Waiting for the World to ChangeDavid Bowie: ChangesMichael Jackson: Man in the Mirror
Created by: Diane McDonough
Special thanks to Dan Williams
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References
http://www.nrdc.org/globalwarming/qthinice.asphttp://ecocentric.blogs.time.com/2010/09/09/climate-change-a-slowdown-on-polar-melt/http://www.carbonme.org/globalwarming.phphttp://www.moreinterestingfacts.com/global-warming-factshttp://epa.gov/climatechange/emissions/index.htmlhttp://www.bom.gov.au/lam/Students_Teachers/ozanim/ozoanim.shtmlhttp://www.theozonehole.com/images/ozoned2.jpghttp://earthobservatory.nasa.gov/Features/ChemistrySunlight/chemistry_sunlight3.phphttp://www.nwf.org/global-warming/effects-on-wildlife-and-habitat/polar-bears.aspx