This video shows the changes in Arctic sea ice coverage from 1979 to 2012. It was developed by Ignatius G. Rigor at the University of Washington, Seattle Applied Physics Lab. The pulses depict the annual expansion and contraction of the sea ice from winter to summer. Pay attention to how much ice coverage there is in 1979 compared with the video's end in 2012. The dots represent the buoys that measure the ice. The very end includes a flashback to 1979 to make it easier to visualize the changes.

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