Bidisha Banerjee and George Collins have written the definitive account of the error in the WG2 report about Himalayan glaciers:
Dozens of articles and analyses of this situation, whether dashed-off blog posts or New York Times coverage, exhibit a curious consistency. Not a single article or analysis appears to include all relevant issues without introducing at least one substantial error. It’s as though the original documents contained a curse which has spread to infect every commentator and reporter. The curse seems to stem from not reading sources carefully (or at all), which, ironically, was the IPCC Working Group II’s central failing, and also a major issue in the documents that were the basis of the defective paragraph.