FILE - In this April 14, 2011 file picture the the Glencore headquarters in Baar, Switzerland is photographed. Commodities trader Glencore , which supplies key raw materials such as oil, copper and wheat and owns plants, warehouses and mines, said Tuesday, Aug. 21, 2012, its first-half net income attributable to shareholders fell to US dollar 2.275 billion, down from US dollar 2.474 billion in the comparable period of 2011. (AP Photo/Keystone, Urs Flueeler)