Tldr; between 2003 and 2011 the Arctic sea ice volume decreased by 50% or 900km³ per year. Latest PIOMAS volume reads 3,400 km³.
With a tremendous effort and more importantly in a public way the Environmental Audit Committee invited and interviewed experts and scientists to collect all evidence about the conditions in the Arctic.
Topics cover everything from methane, permafrost, black carbon over sea ice to polar bears and more. The report went online earlier this day and is the most extensive and actual reader available now.
Here is the paragraph concerning volume and the conclusion:-> continue reading