Mining giant Glencore rides commodities rollercoaster

Glencore, a global resources giant which traces its roots back to a Swiss firm launched by the late Marc Rich, a trader who made it onto the FBI's 10 most wanted list, encapsulates all the woes of the commodities crash, and more. Chained down by some $30 billion in debt, and hit by a commodity price collapse as China's economic boom slows and its hunger for raw materials wanes, the group based in Baar, Switzerland, has been at the mercy of volatile financial markets. Since listing on the Hong Ko