The extraordinarily cold, snowy weather that hit parts of the US East Coast and Europe was the result of a collision of two periodic weather patterns in the Atlantic and Pacific Oceans, a new study in the journal Geophysical Research Letters finds. (American Geophysical Union release)
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Parts of the Arctic have cooled over the past century, but temperatures have been rising steeply since 1990, according to a summer temperature reconstruction for the past 400 years produced on the base of tree rings from regions beyond the Arctic Circle.
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The snowy peaks of the three Peruvian volcanoes provide a stark contrast to the surrounding desert of the Puna Plateau in this astronaut photo from July 15, 2010.
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