Comment on Hiding the Decline: Part III by Hector M.

AR5 is already in the making. A good start for restoring credibility would be that their report (and also the SPM) includes something like the following:
1. In TAR it was suggested that recent warming was unprecedented in the latest millennium, based on paleo proxy reconstructions. These results have been the object of intense debate, not yet resolved, and we no longer can say that recent warming is likely to be unprecedented.
2. The instrumental series of mean global temperature since 1850 seems to have been affected by several problems concerning the choice of stations, especially in China, and the fact that many stations have grown increasingly surrounded by heat-retaining materials such as tin roofs, concrete, asphalt and others, and by heat-emitting devices such as cars, factories and airplanes. Even if consensus appears to exist that some warming has existed in the second half of the 20th century, the global mean temperature series is now under revision. This would mandate new calibration of Global Circulation Models, which will affect future projections of future climate.
3. Since the role of clouds is not yet properly understood, the estimated value for climate sensitivity is affected by higher uncertainty than thout at the time of TAR and AR4