A surge in global food prices has prompted fresh criticism of US subsidies for ethanol, which diverts massive amounts of corn from global food supplies for energy. Senators Tom Coburn, a Republican from Oklahoma, and Ben Cardin, a Maryland Democrat, introduced a measure last month to scrap the tax credit of 45 cents per gallon for ethanol in gasoline. "The ethanol tax credit is bad economic policy, bad energy policy and bad environmental policy. The $6 billion we waste every year on corporate welfare should instead stay in taxpayers' pockets where it can be used to spur innovation, stimulate growth...