The National Snow and Ice Data Center (NSIDC) put together all the data they've ever collected via satellite and produced a motion picture graphic.
They've put it up at YouTube. Here's an embed, "Arctic Sea Ice timelapse from 1978 to 2009"
In 2007 I posted a similar mpeg animation, derived from the Defense Meteorological Satellite Program (DMSP) Special Sensor Microwave Imager (SSMI).
I like the DMSP mpeg4 visualization, but the NSIDC visualization has five extra years data. And, most importantly I think, the new one is better 'tuned'; it better represents what a viewer on the ground would see; James Bay at the bottom of Hudson's Bay Canada becomes ice-bound every year (so far), as does the Alaskan Archipelago.
My StatCounter account shows I've gotten a lot of visits to the movie; people like to see the data like that. Very effective imho.
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