Arctic sea ice

(Newser) - In what scientists say is an historic moment, both Northeast and Northwest Passages are navigable as of this week, and shipping firms are salivating over the  possibilities, Der Spiegel reports. With an increasing number of largely ice-free days every summer, the radical shortcuts offered by the once-treacherous routes will eventually...

(Newser) - The North Pole may become free of ice this summer for the first time in human history. Thick Arctic sea ice that normally covers the polar region has been replaced by ice that formed only in the last year and is susceptible to seasonal melting, reports the Independent. It's a...

(Newser) - A Canadian expedition has found a major new network of cracks, more than 10 miles long, in the Arctic's ice shelves, the BBC reports. Scientists say the huge shelves are disintegrating; pieces become "ice islands" that can float hundreds of miles away as climate changes takes hold. Arctic sea...

(Newser) - The state of Alaska will sue to challenge the federal government's decision to place polar bears on the endangered species list, reports CBC News. The Department of the Interior  cited the bears' diminishing sea ice habitat as a reason for listing them as threatened, but Alaska Gov. Sarah Palin fears...