Arctic ice pack
The trends from 1979 to 2002 have been a statistically significant Arctic sea ice decrease of 2.5% ± 0.9% per decade during those 23 years. Climate models simulated this trend in 2002. The September minimum ice extent trend for 1979–2011 declined by 12.0% per decade during 32 years.  In 2007 the minimum extent fell by more than a million square kilometers, the biggest decline since accurate satellite data has been available, to . New research shows the Arctic Sea ice to be melting faster than predicted by any of the 18 computer models used by the Intergovernmental Panel on Climate Change in preparing its 2007 assessments. In 2012, a new record low of about  was reached.