New Scientist: For the first time since observations began, ozone destruction over the Arctic in early 2011 was comparable to that over Antarctica. Although the Arctic ozone layer suffers a little damage every winter, the effect is usually short-lived. In the first three months of this year, however, more than 80% of the existing ozone was destroyed at a height of 18–20 km—a loss twice that seen in the two previous record-setting Arctic winters, 1996 and 2005, according to Nathaniel Livesey of the Jet Propulsion Laboratory in Pasadena, California, who is an author of a paper published in Nature. Scientists are now looking to see whether climate change could be partly responsible.