The world’s food situation is bleak, and shortsighted policies in the United States and other wealthy countries — which are diverting crops to environmentally dubious biofuels — bear much of the blame.

According to the United Nations Food and Agriculture Organization, the price of wheat is more than 80 percent higher than a year ago, and corn prices are up by a quarter. Global cereal stocks have fallen to their lowest level since 1982.

Grain farmers will need to harvest record crops every year to meet increasing global food demand and avoid famine, Potash Corp. of Saskatchewan Inc. Chief Executive Officer William Doyle said.

People and livestock are consuming more grain than ever, draining world inventories and increasing the likelihood of shortages, Doyle said yesterday in an interview on Bloomberg Television. Global grain stockpiles fell to about 53 days of supply last year, the lowest level since record-keeping began in 1960, according to the U.S. Department of Agriculture.

What is really catching the attention of Goldman Sachs now is the outlook for agricultural prices. Or as Jeff Currie, head of commodities research at the US bank, says with disarming cheer: “We think we could go into crisis mode in many commodities sectors in the next 12 to 18 months . . . and I would argue that agriculture is key here.”

Now, to some readers of the Financial Times, that observation might seem odd. After all, inhabitants of the western world typically spend far more time worrying about the price of petrol for their car, rather than the price of wheat or corn. And when western investors do think about “commodity shock”, their reference point typically tends to be the 1970s oil crisis.

In an “unforeseen and unprecedented” shift, the world food supply is dwindling rapidly and food prices are soaring to historic levels, the top food and agriculture official of the United Nations warned Monday.

The changes created “a very serious risk that fewer people will be able to get food,” particularly in the developing world, said Jacques Diouf, head of the UN Food and Agriculture Organization.

The agency’s food price index rose by more than 40 percent this year, compared with 9 percent the year before - a rate that was already unacceptable, he said. New figures show that the total cost of foodstuffs imported by the neediest countries rose 25 percent, to $107 million, in the last year.