Can the World Continue Feed Itself?

"Politicians," Mr. Brabeck-Letmathe says, "do not understand that between the food market and the energy market, there is a close link." That link is the calorie.

The energy stored in a bushel of corn can fuel a car or feed a person. And increasingly, thanks to ethanol mandates and subsidies in the U.S. and biofuel incentives in Europe, crops formerly grown for food or livestock feed are being grown for fuel. The U.S. Department of Agriculture's most recent estimate predicts that this year, for the first time, American farmers will harvest more corn for ethanol than for feed. In Europe some 50% of the rapeseed crop is going into biofuel production, according to Mr. Brabeck-Letmathe, while "world-wide about 18% of sugar is being used for biofuel today."

In one sense, this is a remarkable achievement—five decades ago, when the global population was half what it is today, catastrophists like Paul Ehrlich were warning that the world faced mass starvation on a biblical scale. Today, with nearly seven billion mouths to feed, we produce so much food that we think nothing of burning tons of it for fuel.

Or at least we think nothing of it in the West. If the price of our breakfast cereal goes up because we're diverting agricultural production to ethanol or biodiesel, it's an annoyance. But if the price of corn or flour doubles or triples in the Third World, where according to Mr. Brabeck-Letmathe people "are spending 80% of [their] disposable income on food," hundreds of millions of people go hungry. Sometimes, as in the Middle East earlier this year, they revolt.

"What we call today the Arab Spring," Mr. Brabeck-Letmathe says over lunch at Nestle's world headquarters, "really started as a protest against ever-increasing food prices."

An important interview in The Wall Street Journal.