From a December 17 Los Angeles Times editorial on the email, released by Media Matters, in which Fox News Washington managing editor Bill Sammon ordered his network's journalists to “refrain from asserting that the planet has warmed (or cooled) in any given period without IMMEDIATELY pointing out that such theories are based upon data that critics have called into question”:

The memo went out 15 minutes after a Fox News reporter accurately explained to viewers that United Nations scientists had issued a report saying 2000 to 2009 was shaping up to be the warmest decade on record — even warmer than the 1990s, which were warmer than the 1980s.

Such data aren't in serious dispute among climate scientists. The way the data are interpreted can vary; it's legitimate for climate skeptics to reach conclusions that contradict mainstream theories. But only a crank would deny the underlying temperature data that show the Earth getting warmer — records compiled by independent stations around the world, combined with satellite measurements and confirmed by observations of rising sea levels, vanishing glaciers and other inputs — because to do so is to deny material and measurable facts. Instructing reporters to treat such facts as controversial is like telling them to question the laws of gravity when discussing plane crashes. The only reason for doing it is to further a partisan agenda, in this case an attempt to cast doubt on climate science in order to fend off government efforts to limit greenhouse gases.

Fox should either come clean about this and crack down on such partisanship in its news ranks, or it should stop pretending to be an objective news source.