How much has September Arctic sea ice extent reduced since 1979?

The Arctic sea ice extent has experienced a significant reduction since 1979.

The reduction in Arctic sea ice extent has been more pronounced in recent decades, particularly in the summer months, such as September, when sea ice typically reaches its minimum extent.

The map below shows an average annual decline in arctic sea ice extent in September mapped over Europe's landmass to give a sense of the scale of the reduction.