The article is more than a year old, and it is complaining that the supporting data was not published by the IPCC at the same time as it issued its report.
It would be better to know if the data has now been released, and what are the comments by experts on that data.
“In 2007, the Intergovernmental Panel on Climate Change (IPCC) issued its Fourth Assessment Report. The report included predictions of big increases in average world temperatures by 2100, resulting in an increasingly rapid loss of the worlds glaciers and ice caps, a dramatic global sea level rise that would threaten low-lying coastal areas, the spread of tropical diseases, and severe drought and floods.
These dire predictions are not, however, the result of scientific forecasting; rather, they are the opinions of experts. Expert opinion on climate change has often been wrong. For instance, a search of headlines in the New York Times found the following:”