First question that came to my mind is how is this measured. I found the answer here: http://nsidc.org/arcticseaicenews/faq/#area_extent http://nsidc.org/arctic

First question that came to my mind is how is this measured. I found the answer here: http://nsidc.org/arcticseaicenews/faq/#area_extent http://nsidc.org/arcticseaicenews/faq/#area_extent Which begs the next question: Are there other independent measurements that confirm this?