Earlier this month, previously classified images showing the dramatic retreat of Arctic sea ice were released by the U.S. government. The one-metre-resolution images were taken by spy satellites on behalf of scientists studying climate change who were looking for images of Arctic sea ice during the summer, but the images were deemed “unsuitable for release” before now. The images are available here in raw form, with posters available here. News coverage: the Guardian, Reuters. Via Universe Today and Elizabeth Hand.