Armed conflict leaves scars that outlast ceasefires, and a sweeping new global analysis suggests some of the deepest are carved into farmland. The study, published in Nature Food on Sept. 24, reports that conflict accelerates cropland loss — and that the effects can keep building for years after fighting begins, varying sharply with how severe the conflict is and with local social conditions.
The research was led by professor Li Guangdong, Dr. Qi Wei and professor Wang Zhenbo at the Institute of Geographic Sciences and Natural Resources Research, part of the Chinese Academy of Sciences. Their goal was to answer a question that had previously been addressed mostly through individual case studies rather than at planetary scale: what happens to cropland, over the long run, when armed conflict arrives?
A global blind spot
Food insecurity and war are widely understood to travel together. Conflict disrupts planting seasons, scatters farming communities, damages irrigation and transport networks, and makes markets dangerous to reach. What has been far less clear is how durable those effects are on the land itself, and whether they can be detected consistently across countries with very different economies, climates and institutions.
The authors note that the long-term consequences of armed conflict for cropland have been poorly understood at the global scale — precisely the gap their analysis set out to close.
How the study was built
To do that, the team assembled two very large datasets and laid them over one another. The first was a set of annual global cropland maps at 30-meter resolution covering the two decades from 2000 to 2020, fine enough to distinguish individual fields from surrounding terrain. The second was a catalog of more than 460,000 georeferenced armed conflict events distributed across 155 countries.
The researchers then focused on buffer regions extending five kilometers (about 3.1 miles) outward from each conflict location, tracking how cropland inside those zones changed over time. Because farmland can expand or contract for reasons unrelated to war — shifting commodity prices, urbanization, drought — the team applied difference-in-differences and propensity score matching methods. These statistical techniques compare conflict-exposed areas with otherwise similar places that were spared, helping separate the signature of violence from broader environmental and socioeconomic trends.
A small share of land, a large share of the harvest
One of the study's most striking findings concerns overlap. Areas exposed to armed conflict made up only about 3% of the global land surface, yet they contained more than 6% of the world's cropland as of 2020. In other words, farmland is not randomly scattered with respect to conflict — it is disproportionately concentrated in the places where fighting occurs.
That mismatch matters because it means relatively contained geographic conflicts can carry outsized consequences for food supply well beyond their borders.
Measuring the loss
Across the 2000–2020 window, total global cropland expanded. Inside conflict-affected areas, however, the trend ran the other way: cropland edged downward. The analysis attributed an average 3.01% reduction in cropland area to armed conflict, a figure that translates into an annual loss of 14.46 hectares — roughly 35.7 acres — for every conflict-exposed buffer region studied.
A separate spatial comparison reinforced the pattern. Conflict-affected areas experienced 23.7% greater cropland loss than otherwise comparable areas untouched by conflict.
Perhaps most consequential, the researchers found that these effects did not fade quickly. Cropland losses persisted for years after conflict onset, meaning the agricultural toll of a war can continue to mount long after the initial disruption.
Hotspots in Africa and Southeast Asia
The heaviest losses were not evenly distributed. The study identifies western Africa, eastern Africa and Southeast Asia as the regions where cropland declines linked to conflict were most pronounced. These are places where smallholder agriculture is often the backbone of local economies, which can amplify the human consequences of losing arable land.
The authors also emphasize that outcomes are not uniform. The magnitude of cropland loss varied substantially with conflict severity and with prevailing social conditions, suggesting that how a society is organized — its institutions, safety nets and capacity to absorb shocks — shapes how much farmland it ultimately loses.
Why the damage lingers
While the study's methods establish association rather than a single causal pathway, its findings align with what is known about how conflict reshapes rural life. Land can be abandoned when farmers flee, left uncultivated when inputs and labor become unavailable, contaminated by unexploded ordnance, or cut off from markets by damaged roads. Each of those conditions can persist well past the period of active fighting, which helps explain why the researchers detected multi-year declines rather than a swift rebound once hostilities eased.
The buffer-zone approach also captures something a simple national tally would miss: conflict rarely affects a country evenly. Fighting concentrates in particular districts, valleys and transport corridors, and those are exactly the places where the satellite record shows cropland thinning out.
Why it matters beyond the battlefield
The analysis arrives at a moment when food systems are already under pressure from climate extremes and economic shocks. By quantifying how much cropland conflict removes from production — and how long it stays out — the study offers a way to treat war as an agricultural shock with a measurable footprint, rather than an amorphous backdrop to hunger crises.
That framing has practical implications. Recovery planning, land rehabilitation and humanitarian targeting all depend on knowing where farmland damage is concentrated and how long it is likely to last. The research also underscores that conflict-exposed cropland occupies a modest share of the planet's surface but a much larger share of its productive capacity, making those areas strategically significant far beyond the front lines.
The bottom line
Drawing on two decades of satellite-derived cropland maps and hundreds of thousands of conflict records, the Chinese Academy of Sciences-led team concludes that armed conflict measurably erodes farmland and the food production it supports — and that the erosion continues for years after it begins. The losses cluster in western and eastern Africa and in Southeast Asia, scale with conflict intensity and social context, and fall disproportionately on agricultural land that the world can least afford to lose.
This article is based on reporting by Phys.org. Read the original article.
Originally published on phys.org
