The latest development is that the report ignored the fact that the Antaric ice was growing and that the report understated the
Antarctic Sea Ice Increase by 50%
While all the press is about the observed declines in Arctic sea ice extent in recent decades, little attention at all is paid to the fact that the sea ice extent in the Antarctic has been on the increase. No doubt the dearth of press coverage stems from the IPCC treatment of this topic.
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So, the peer reviewed literature, both extant at the time of the AR4 as well as published since the release of the AR4, shows that there has been a significant increase in the extent of sea ice around Antarctica since the time of the first satellite observations observed in the late 1970s. And yet the AR4 somehow “assessed” the evidence and determined not only that the increase was only half the rate established in the peer-reviewed literature, but also that it was statistically insignificant as well. And thus, the increase in sea ice in the Antarctic was downplayed in preference to highlighting the observed decline in sea ice in the Arctic.