Critics have long questioned the commitment of a growing share of a food source for fuel use. But the calls for change have grown louder because the widespread drought has killed more than 50% of the corn crop, driving prices to record levels — and U.S. ethanol is made mostly from corn.

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The drought is pushing up the cost of meat and milk and other dairy products for the state's consumers. That's because the cost of feed for California cattle, poultry and hog farmers is soaring as Midwest farms face a shortage of corn and soybean — key feed ingredients.

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