io9 wrote This polar vortex graphic is the most upsetting map of the winter. Here's the video:
Here's a related video showing the Amount of old ice in Arctic, 1987-2013. "The winter ice pack in the Arctic was once dominated by old, thick ice. Today, very little old ice remains. This animation shows maps of sea ice age from 1987 through the end of October 2013. Age class 1 means "first-year ice," which is ice that formed in the most recent winter. The oldest ice (9+) is ice that is more than 9 years old."
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