By Lester R. Brown

The world is in transition from an era of food abundance to one of scarcity. Over the last decade, world grain reserves have fallen by one third. World food prices have more than doubled, triggering a worldwide land rush and ushering in a new geopolitics of food. Food is the new oil. Land is the new gold.

This new era is one of rising food prices and spreading hunger. On the demand side of the food equation, population growth, rising affluence, and the conversion of food into fuel for cars are combining to raise consumption by record amounts. On the supply side, extreme soil erosion, growing water shortages, and the earth’s rising temperature are making it more difficult to expand production. Unless we can reverse such trends, food prices will continue to rise and hunger will continue to spread, eventually bringing down our social system. Can we reverse these trends in time? Or is food the weak link in our early twenty-first-century civilization, much as it was in so many of the earlier civilizations whose archaeological sites we now study?

This tightening of world food supplies contrasts sharply with the last half of the twentieth century, when the dominant issues in agriculture were overproduction, huge grain surpluses, and access to markets by grain exporters. During that time, the world in effect had two reserves: large carryover stocks of grain (the amount in the bin when the new harvest begins) and a large area of cropland idled under U.S. farm programs to avoid overproduction. When the world harvest was good, the United States would idle more land. When the harvest was subpar, it would return land to production. The excess production capacity was used to maintain stability in world grain markets. The large stocks of grain cushioned world crop shortfalls. When India’s monsoon failed in 1965, for example, the United States shipped a fifth of its wheat harvest to India to avert a potentially massive famine. And because of abundant stocks, this had little effect on the world grain price.

When this period of food abundance began, the world had 2.5 billion people. Today it has 7 billion. From 1950 to 2000 there were occasional grain price spikes as a result of weather-induced events, such as a severe drought in Russia or an intense heat wave in the U.S. Midwest. But their effects on price were short-lived. Within a year or so things were back to normal. The combination of abundant stocks and idled cropland made this period one of the most food-secure in world history. But it was not to last. By 1986, steadily rising world demand for grain and unacceptably high budgetary costs led to a phasing out of the U.S. cropland set-aside program.

Today the United States has some land idled in its Conservation Reserve Program, but it targets land that is highly susceptible to erosion. The days of productive land ready to be quickly brought into production when needed are over.

Surplus Grain: the Metric for Food Security

Ever since agriculture began, carryover stocks of grain have been the most basic indicator of food security. The goal of farmers everywhere is to produce enough grain not just to make it to the next harvest but to do so with a comfortable margin. From 1986, when we lost the idled cropland buffer, through 2001, the annual world carryover stocks of grain averaged a comfortable 107 days of consumption.

This safety cushion was not to last either. After 2001, the carryover stocks of grain dropped sharply as world consumption exceeded production. From 2002 through 2011, they averaged only 74 days of consumption, a drop of one third. An unprecedented period of world food security has come to an end. Within two decades, the world had lost both of its safety cushions.

In recent years, world carryover stocks of grain have been only slightly above the 70 days that was considered a desirable minimum during the late twentieth century. Now stock levels must take into account the effect on harvests of higher temperatures, more extensive drought, and more intense heat waves. Although there is no easy way to precisely quantify the harvest effects of any of these climate-related threats, it is clear that any of them can shrink harvests, potentially creating chaos in the world grain market. To mitigate this risk, a stock reserve equal to 110 days of consumption would produce a much safer level of food security.

The world is now living from one year to the next, hoping always to produce enough to cover the growth in demand. Farmers everywhere are making an all-out effort to keep pace with the accelerated growth in demand, but they are having difficulty doing so.

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