Arctic Ice

In 2006, a modeling study using NCAR’s Community Climate System Model showed that Arctic sea ice would melt abruptly, leading to an ice-free summer Arctic as early as 2040. These findings were underscored by massive melting of the Arctic ice the following year. By September 2007, the extent of Arctic ice was at the lowest point ever observed—some 30 percent below the average extent of the preceding 28 years.