Food for fuel

Since President Bush gave the US corn and ethanol futures markets a boost in his 2006 State of the Union address, international investors seeking alternative assets have been creating a lot of volatility in Chicago's commodity markets.

Trading volumes and prices on grain futures on the Chicago Mercantile Exchange (CME) and the Chicago Board of Trade (CBOT) are at historical highs, partly driven by demand for biofuel feedstock from the energy sector. And while the 150-year-old exchanges have s