Associated Press: By executive action, the Obama administration can boost the U.S. target for reducing greenhouse gas emissions beyond levels envisioned in legislation working its way through Congress, the head of the U.N. climate science network said Sunday. “There is scope for going above what is going to be legislated,” Rajendra Pachauri, chairman of the Intergovernmental Panel on Climate Change, told The Associated Press on the eve of the U.N. climate conference in Copenhagen. Senate and …