AAP: The Rudd government has questioned whether there’s any point to negotiating on emissions trading when the coalition remains unmoved on the science behind man-made global warming. Labor has also taken another crack at Malcolm Turnbull and his shaky grasp on the leadership, this time blaming him for thwarting good faith negotiations by having failed to earn the backing of his party room. Negotiations plunged to a new low on Monday after Opposition Senate Leader Nick Minchin …