Canadian journalist Donna Laframboise has been watching the climate world since 2009. What she sees isn't pretty.
On page 25 of Chapter 2 and page 58 of Chapter 4 (Working Group 2 report of the AR5), the sole evidence the IPCC cites for a claim about the Arctic is a 2012 document authored by Christie and Sommerkorn.
This is not peer-reviewed science, published in a reputable scientific journal. Rather, it is a publication produced by the activist WWF.
Even after the embarrassingly Himalayan glacier scandal, in 2014 the IPCC still permits its personnel to treat activist publications as reliable evidence.