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A mysterious, centuries-long cool spell, dubbed the Little Ice Age, appears to have been caused by a series of volcanic eruptions and sustained by sea ice, a new study indicates. [More]

The Arctic has transformed over the last five years into a region that's warmer and greener, with larger patches of open water as sea ice recedes. [More]

By Gerard Wynn 500 MILES FROM THE NORTH POLE (Reuters) - The minimum summertime volume of Arctic sea ice fell to a record low last year, researchers said in a study to be published shortly, suggesting that thinning of the ice had outweighed a recovery in area. [More]