Consider the simple fact, drawn from the official temperature records of the Climate Research Unit at the University of East Anglia, that for the years 1998-2005 global average temperature did not increase (there was actually a slight decrease, though not at a rate that differs significantly from zero).
Yep. That should prove it alright. A period of a whole eight years, most of which were among the hottest recorded, in which there was little or no increase, has got to be conclusive.
Where does Murdoch get these bozos? In Bob's case, it appears to be the Geology Department at James Cook University, Queensland.