This interactive visualization from the NASA Earth Observatory website compares Arctic sea ice minimum extent from 1984 to that of 2012.
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Slider is easy to use; images are clear.
Quite a bit of informational text accompanies the graphic.
Further resources for exploration are hyperlinked in the text.
The amount of sea ice loss over the past 28 years is quite dramatic.
Accompanying background information discuss how the data was collected and explains the loss of ice extent as a positive feedback mechanism.
Comments from expert scientist: The development of Arctic sea ice is an important topic. The sea ice extent minimum of 2012 is presented in a clear manner that is easy to understand, but also conveys its importance.
Educators could also use images alone with slider tool, without the text, or could paraphrase or simplify text.
CLEAN resource [link http://serc.carleton.edu/resources/44665.htm] is a video that addresses Arctic sea ice extent over a similar time period.
Additionally, there is a useful Arctic sea ice change visualization and plot from NASA that may be found at [link http://www.youtube.com/watch?v=dKbWN5YpgIU].