For instance, Wikipedia has a page: Description of the Medieval Warm Period and Little Ice Age in IPCC reports .
The opening paragraphs of this page are below:
The description of the Medieval Warm Period and Little Ice Age in IPCC reports has changed since the first report in 1990 as scientific understanding of the temperature record of the past 1000 years has improved. The Medieval Warm Period (MWP) and Little Ice Age (LIA) are the best-known temperature fluctuations in the last millennium.
Critics of the "hockey stick graph" of later reports have claimed that the record of the MWP and LIA were suppressed in the IPCC Third Assessment Report, although every report has discussed the phenomena.
When the various links above are followed, what is found are one-sided expositions of the Mann et all “hockey stick” temperature reconstruction of the past 1,000 years – which wrote off the Medieval Warm Period – and dismissal of the criticism by Steve McIntyre and the total ignoring of Soon et al finding that the Medieval Warm Period was a global phenomenon and was warmer than the present period. It also has no mention that the tree-ring proxy reconstructions of temperatures do not show warming after 1960, casting doubt on their ability to show prior warming (i.e., Medieval Warm Period warming).
The assertion that the "scientific understanding of the temperature record of the past 1,000 years has improved" is unsupported by any by any reference to what caused the improvement, and in what way it was improved.
The statement concerning suppression of the Medieval Warm Period and Little Ice Age, that "every report has addressed the phenomena" can only be considered accurate to the extent that some contained a brief mention without discussion, and others contained brief, broad dismissals of them.
Any claim by Wikipedia of fairness and neutrality in their pages concerning climate change are therefore subverted by the heavy-handed editing of William M. Connolley, who selectively includes or omits information and sources on the basis of whether they are in accord with anthropogenic global warming.
Apparently Mr. Connolley thinks he can simulate fairness by adhering to the strict title of this Wikipedia page, that it is about the description of the Medieval Warm Period and Little Ice Age in IPCC reports without going into the criticisms of the IPCC description.
I could do the same by making a post describing how God created the Earth 6,000 years ago, and only allowing items in the post concerning God’s creative accomplishments. I could dismiss criticisms by noting that many theologians are on board with my post, and have been for thousands of years.
I don’t understand why Wikipedia allows the pursuit of knowledge to be hijacked by an advocate of a point of view. Then again, the Church did the same with Galileo, lost credibility, and opened the way for the Reformation.
Wikipedia, reform thyself!