Thinner Arctic ice?
Some kind of global warming
could be at work here.
From National Geographic News:
Turns out there is such a thing as being too young and too thin.
Arctic ice continued its decline this winter, with hardy, thicker old ice increasingly being replaced with quick-to-melt, thinner young ice, according to a new report by NASA and the National Snow and Ice Data Center.
This troubling National Geographic video has more. (Not seeing the video? View it here.)