we have hard data showing that it has in fact warmed.
Not "in any given period" we don't. We have evidence that the planet has both warmed and cooled in any arbitrary period you might like to choose.
I'm no fan of Murdoch and his little wizards and familiars butFox living up to its self-professed "balanced" ideal as usual, I see.
"refrain from asserting that the planet has warmed (or cooled) in any given period"
sounds to me like they're asserting that they should refrain from asserting anything. Which would be a good thing for any media organisation. Whether this happens in practice remains to be seen of course.