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michael · super moderator Joined: 13 Oct 2007 Posts: 981

A natural cause may account for much of the recent dramatic thawing of the Arctic region, in addition to man-made global warming, a new study finds.

New research indicates a natural and cyclical increase in the amount of energy in the atmosphere that moves from south to north around the Arctic Circle, according to the study published in the journal Nature.

The summer of 2007, like the summer of 2005, smashed all records for loss of summer sea ice in the Arctic Ocean and ice sheet in Greenland. In September, the Arctic Ocean had 23 per cent less sea ice than the previous record low. Greenland's ice sheet melted 19 billion tons more than its previous record.

Study
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