Ellen Kullman, chair of the board and chief executive officer of DuPont asks a question at the Summer Davos Forum in the city of Dalian in Northeast China's Liaoning province on Sept 10, 2013. [Photo / Xinhua]
Klaus Kleinfeld, chairman and chief executive officer of Alcoa Inc, asks a question at the Summer Davos Forum in the city of Dalian in Northeast China's Liaoning province on Sept 10, 2013. [Photo / Xinhua]