View  http://www.earth-policy.org/Updates/2007/Update65.htm to get the full copy that Lester R. Brown wrote

"Corn prices have doubled over the last year, wheat futures are trading at their highest level in 10 years, and rice prices are rising too. In addition, soybean futures have risen by half. A Bloomberg analysis notes that the soaring use of corn as the feedstock for fuel ethanol “is creating unintended consequences throughout the global food chain.” "

There is much more in that URL