The article "Wikipedia's zealots" from Lawrence Solomon of the Financial Post (link) details issues with the WP article about University of California San Diego professor Naomi Oreskes, who wrote a paper claiming that there was wide consensus about global warming. The paper was challenged by UK scientist Benny Peiser:
...when visiting Oreskes's page on Wikipedia several weeks ago, I was surprised to read not only that Oreskes had been vindicated but that Peiser had been discredited. More than that, the page portrayed Peiser himself as having grudgingly conceded Oreskes's correctness.
Upon checking with Peiser, I found he had done no such thing. The Wikipedia page had misunderstood or distorted his comments. I then exercised the right to edit Wikipedia that we all have, corrected the Wikipedia entry, and advised Peiser that I had done so.
Peiser wrote back saying he couldn't see my corrections on the Wikipedia page. Had I neglected to save them
after editing them, I wondered. I made the changes again, and this time confirmed that the changes had been saved. But then, in a twinkle, they were gone again!
UPDATE: "Wikipropaganda On Global Warming" from the same author (link) has more on the general issue:
Kim Dabelstein Petersen is a Wikipedia “editor” who seems to devote a large part of his life to editing reams and reams of Wikipedia pages to pump the assertions of global-warming alarmists and deprecate or make disappear the arguments of skeptics... Holding the far more prestigious and powerful position of “administrator” is William Connolley. Connolley is a software engineer and sometime climatologist (he used to hold a job in the British Antarctic Survey), as well as a serial (but so far unsuccessful) office seeker for England’s Green party... And yet by virtue of his power at Wikipedia, Connolley, a ruthless enforcer of the doomsday consensus, may be the world’s most influential person in the global warming debate after Al Gore. Connolley routinely uses his editorial clout to tear down scientists of great accomplishment such as Fred Singer, the first director of the U.S. National Weather Satellite Service and a scientist with dazzling achievements. Under Connolley’s supervision, Wikipedia relentlessly smears Singer as a kook who believes in Martians and a hack in the pay of the oil industry.