In 2019, as war raged in Yemen, locusts took flight—swarms of billions strong, each capable of devouring the daily food supply of 625,000 people, sweeping across East Africa and beyond. That outbreak, fueled by broken monitoring, left 445,000 children with stunted growth, most not even born when the crisis began. Now, a groundbreaking study reveals that maintaining early warning systems for desert locusts doesn’t just prevent famine—it delivers up to $680 in returns for every $1 invested, primarily by safeguarding child nutrition.
For over three decades, the Food and Agriculture Organization’s locust monitoring system has stood as one of the world’s longest-running disaster early warning programs. Yet its success has made its value hard to measure: when surveillance works, swarms are stopped before they form, and damage never materializes. To crack this puzzle, researchers Joséphine Gantois, Anouch Missirian, and Eyal Frank examined what happens when monitoring fails—not by design, but by conflict. Using machine learning and 30 years of swarm data, they traced how reduced surveillance in breeding zones, especially during rainy seasons, leads to explosive outbreaks that migrate across borders, devastating crops and lives far from the original blind spots.
The human cost is stark. Children exposed to locust-driven food shortages while in utero are 18% more likely to suffer stunted growth and face a higher risk of dying before age five. In 2019, 83% of the 445,000 affected children lived not in Yemen, but in neighboring countries like Ethiopia, Kenya, and Somalia—proof that failure in one place ignites a regional crisis. The economic toll is equally severe: stunted growth across populations slashes national productivity, shaving an estimated $25 billion annually from global GDP. Yet the cost of prevention is minimal in comparison. The desert locust monitoring system, even with its global reach, is a fraction of the losses it averts.
Beyond locusts, the study offers a powerful blueprint for climate resilience. As extreme weather and pest outbreaks grow more frequent, early warning systems will be critical shields for food security and public health. The findings underscore the need for sustained international funding and coordination—especially in conflict zones where monitoring is most fragile. When we protect the systems that protect us, the returns aren’t just financial; they’re measured in healthier children, stronger economies, and more stable regions. In a warming world, prevention isn’t just prudent—it’s priceless.