image: Photo of relict ice wedges formed during the Pleistocene when temperatures were colder than today. These ice wedges are remnants of much colder climate of the past and have survived underground for hundreds of thousands of years in the Arctic. This image relates to an article that appeared in the Sep. 19, 2008, issue of Science , published by AAAS. The study, by Dr. Duane Froese and colleagues at University of Alberta in Edmonton, Alberta, Canada was titled "Ancient Permafrost and a Future, Warmer Arctic." view more
Credit: Image courtesy of Charles Q. Choi