The truth is Prof Muller is the guy who soundly supported the IPCC using good science, in the face of the CRU fiasco.
First I am a big admirer of Muller's work as an astrophysicist.
Secondly, this video has been thrown around by warming skeptics as PROOF...of...nothing. Mostly because they never bothered to read anything else Muller has said about global warming.
Turns out Muller was invited by Congressional Republicans to put the nail in the Climate Change Coffin a few months ago. What a mistake on their part. You see how it works? One video doth not the truth make...I'll bet the (energy lobby bought) Republicans were positive THIS was the guy to use against Al Gore...never bothering to actually ask him what he would say when he testified.
He supported IPCC Climate Change data, to the chagrin of the House Republicans who had invited him after seeing the video you just posted. Muller supports the IPCC: He just doesn't like number fudging.
Guess what he told Congress? Climate change is happening.
Q: You testified that the scientists maintaining the three climate temperature sets—maintained by NASA, the U.S. National Oceanic and Atmospheric Administration, and the U.K. Met Office—have done "excellent" work. So how did you feel when the e-mails from the University of East Anglia emerged?
R.M.: I felt like a woman who's just learned her husband was cheating on her. It doesn't mean he's a bad husband in all ways, but that trust is lost. ... The e-mails didn't relate at all to the temperature work. … It was all the [paleotemperature] proxy data. [But] that disillusioned me.
Q: What does your initial examination of 2% of world temperature stations find in terms of world climate?
R.M.: Some [readings] are going down—but more are going up. The average is going up.
Please read Muller's full work on the subject. You quoted and linked his video out of context believing him to support the skeptics, when in fact he is a Climate Change supporter who was bashing CRU for the errors they made (in judgement).