Weakening Bread Basket Buffer
Drought is one of the most obvious ways climate change weakens food systems. Regions that produce large crops depend on the availability of rainfall, stable soil moisture and reliable planting seasons. When one region experiences a drought, other regions can sometimes compensate for that deficit. But when several regions of the breadbasket are dry at the same time, the system has several alternatives.
A recent study on global drought found that the chance of a simultaneous drought in all corn-producing regions this century is between 52 and 60 percent depending on greenhouse gas emissions. The authors show that this risk is mainly driven by long-term drought in Brazil, Europe and the United States, and that global shocks can occur even when several regions experience moderate drought at the same time.
The risk is not just that climate change reduces yields. It is because it undermines the geographic logic upon which the modern food system depends. Global trade works best when shocks are dissipated. It works very slowly when the areas it is supposed to balance are all under pressure at the same time. What appears to be a rigid system under isolated stress may become brittle under combined stress. Communication, in other words, can be your own form of risk.
The changing nature of the global food system suggests that, as trade networks deepen and more countries rely on imports, shocks do not simply pass through the system. They can be strong within it. A harvest failure in one area can cause export restrictions, cautious buying and widespread instability elsewhere.
The “dynamic” part refers to how the system is more connected over time. A trade link is a link between imports and exports between countries, such as one country supplying another with wheat or rice. As these links increase, the shock has many ways of spreading.
In times of food shortages, food producers will often cut back on exports. In other words, when food is scarce, the same trade links that normally move grain efficiently can become channels of disruption, as countries protect their supplies and import-dependent countries are left exposed.
That is important because food systems are not just farms; they also involve the production and distribution of seeds, animal feed, fertilizers and pest control, as well as storage, transport, processing and marketing.
Events such as drought are not just productivity shocks. It could be a shock to the supply chain. And the more the system relies on tight-time, low-inventory supplies, the more likely it is that the weather stops behaving in a predictable way.
Risks of Business Combinations
Modern agriculture does not depend only on favorable weather. It also relies on a continuous, integrated flow of manufactured inputs arriving at the right place at the right time and at the right price.
That flow is not regulated in an open market with infinite alternatives waiting in the reserve. It goes through the most focused corporate channels.
Business focus and power in food systems creates choice, flexibility and control. The top four global agricultural firms account for about 50 to 60 percent of the commercial seed market, and those same four control about 70 percent of the global pesticide market.
The merger between seed and agrochemical firms, as well as the merger of fertilizers and retail, only deepens that pattern.
In stable times, this can look like power. Large firms can transport large quantities of seeds and chemicals, consolidate cross-border supply, standardize products and reduce transaction costs. Large scale production can make the system faster, cheaper and more readable. However, moderation is not the same thing as intensity.
Fewer, more dominant providers mean fewer alternatives. When a small number of firms dominate the markets for seeds, pesticides and fertilizers, the majority system depends on few decisions and routes.
In a fixed system, disturbances are not always isolated. It flows outward into the greater part of the food chain. Vulnerability is not just scarcity, but compounding: when several pressures arrive at the same time, a concentrated system has very little capacity to repair itself.
Drought Elsewhere We Can Empty the Shelves Here
International food supply shocks show that a single country does not need to experience drought itself to deal with the consequences. If one country or region is highly dependent on imported commodities, a yield shock thousands of kilometers away can drive up prices, tighten supplies and limit access to food.
When it comes to poor communities, even small external shocks can quickly become problematic. The modern food system is built on the expectation that the environment will keep climate risk balanced.
As long as the shock was widespread, reliance on a few key suppliers seemed to work. The program did not need to slow down because it thought that someone, somewhere, was still going to produce.
Now the weather is testing all of that at once.
