Food prices are soaring, a wealthier Asia is demanding better food and farmers can't keep up. In short, the world faces a food crisis and in some places it is already boiling over.
Around the globe, people are protesting and governments are responding with often counterproductive controls on prices and exports - a new politics of scarcity in which ensuring food supplies is becoming a major challenge for the 21st century.
Plundered by severe weather in producing countries and by a boom in demand from fast-developing nations, the world's wheat stocks are at 30-year lows. Grain prices have been on the rise for five years, ending decades of cheap food.
Drought, a declining dollar, a shift of investment money into commodities and use of farm land to grow fuel have all contributed to food woes. But population growth and the growing wealth of China and other emerging countries are likely to be more enduring factors.
World population is set to hit nine billion by 2050, and most of the extra 2.5 billion people will live in the developing world. It is in these countries that the population is demanding dairy and meat, which require more land to produce.
"This is an additional setback for the world economy, at a time when we are already going through major turbulence. But the biggest drama is the impact of higher food prices on the poor," Angel Gurria, head of the Organisation for Economic Cooperation and Development, or OECD, told Reuters.
In Gurria's native Mexico, tens of thousands took to the streets last year over the cost of tortillas, a national staple whose price rocketed in tandem with the price of corn (maize).
Global food prices, based on UN records, rose 35 per cent in the year to the end of January, markedly accelerating an upturn that began, gently at first, in 2002. Since then, prices have risen 65 per cent.
In 2007 alone, according to the UN Food and Agriculture Organisation's world food index, dairy prices rose nearly 80 per cent and grain 42 per cent.
"The recent rise in global food commodity prices is more than just a short-term blip," British think tank Chatham House said in January. "Society will have to decide the value to be placed on food and how ... market forces can be reconciled with domestic policy objectives."
Many countries are already facing these choices.
After long opposition, Mexico's government is considering lifting a ban on genetically modified crops, to allow its farmers to compete with the US, where high-yield, genetically modified corn is the norm.
The EU and parts of Africa have similar bans that could also be reconsidered.
A number of governments, including Egypt, Argentina, Kazakhstan, and China, have imposed restrictions to limit grain exports and keep more of their food at home.
This knee-jerk response to food emergencies can result in farmers producing less food and threatens to undermine years of effort to open up international trade.
"If one country after the other adopts a 'starve-your-neighbour' policy, then eventually you trade smaller shares of total world production of agricultural products, and that in turn makes the prices more volatile," said Joachim von Braun, director general of the International Food Policy Research Institute in Washington.
In Argentina, a government tax on grain led to a strike by farmers that disrupted grain exports.
Vietnam and India, both major rice exporters, announced further curbs on overseas sales on Friday, sending rice higher on US futures markets. Other food commodities retreated from record highs in recent days but analysts attributed that less to fundamentals and more to profit-taking by investors.
In the next decade, the price of corn could rise 27 per cent, oilseeds such as soybeans by 23 per cent and rice nine per cent, according to tentative forecasts in February by the OECD and the UN.
Waves of discontent are already starting to be felt. Violent protests hit Cameroon and Burkina Faso in February. Protesters rallied in Indonesia recently and media reported deaths by starvation. In the Philippines, fast-food chains were urged to cut rice portions to counter a surge in prices.
Last year, the central bank of Australia - where minds were focused by a two-year drought - asked whether the surge in commodity prices could be one of the few really big ones in world history, like those of the mid-1930s or the 1970s.
Real commodity prices remained flat or even fell during the rapid industrialization of the US and Germany in the early 20th century. But the industrialisation of China, with 1.3 billion people, is on a totally different scale, it noted.
"China's population is proportionately much larger than the countries that industrialized in earlier periods and is almost double that of the current G7 nations combined," the Australian central bank said.
The emergence of China's middle class is adding hugely to demand for not just basic commodities like corn, soybeans and wheat, but also for meat, milk and other high-protein foods.
The Chinese, whose rise began in earnest in 2001, ate just 20 kilogrammes of meat per capita in 1985. They now eat 50 kilogrammes a year.
Each pound of beef takes about seven pounds of grain to produce, which means land that could be used to grow food for humans is being diverted to growing animal feed.
As the West seeks to tackle the risk of global warming, a drive towards greener fuels is compounding the world's food problems.
It is estimated that one in four bushels of corn from this year's US corn crop will be diverted to make fuel ethanol. "Turning food into fuel for cars is a major mistake on many fronts." said Janet Larsen, director of research at the Earth Policy Institute, an environmental group based in Washington.
"One, we're already seeing higher food prices in the American supermarket. Two, perhaps more serious from a global perspective, we're seeing higher food prices in developing countries where it's escalated as far as people rioting in the streets."
Similarly, palm oil is at record prices because of demand to use it for biofuel, causing pain for low income families in Indonesia and Malaysia, where it is a staple.