How Extreme Heat Threatens Global Food Supply: Brazil’s Crisis as a Case Study

Brazil’s Agricultural Crisis: A Warning for Global Food Systems

The climate crisis is reshaping agriculture, and Brazil’s struggles with extreme heat offer a stark example of what’s to come. In 2024, Brazil endured back-to-back heat waves, with temperatures soaring to dangerous levels in central and southern regions. Just weeks earlier, Rio de Janeiro recorded a heat index of 144.1°F, the highest in a decade. These events are part of a broader pattern of prolonged and severe heat that has battered one of the world’s largest agricultural powerhouses for years.

Crop and Livestock Losses Mount

Brazil’s agricultural sector, a global leader in soy and corn production, has seen yields decline in key states like São Paulo. Other major crops—including peanuts, potatoes, sugarcane, and arabica coffee—have also suffered widespread losses. Livestock has not been spared; pigs in the central-western region endured severe heat stress for nearly a year. Meanwhile, flooding in Rio Grande do Sul, triggered by a blocked cold front, disrupted supply chains for pink shrimp across Brazil.

These challenges are detailed in a new 94-page report by the World Meteorological Organization (WMO) and the Food and Agriculture Organization of the United Nations (FAO). The report combines weather and agricultural data to illustrate how extreme heat is destabilizing global food systems and offers strategies for producing food in an era where heat extremes are the new normal.

Global Hotspots: How Heat is Reshaping Agriculture Worldwide

While Brazil is the report’s primary case study, other nations are also feeling the strain. In Chile, warming ocean temperatures in 2016 caused massive algae blooms that killed an estimated 100,000 metric tons of farmed salmon and trout—the largest aquaculture mortality event in history. The U.S. Pacific Northwest faced its own crisis in 2021, when a record-breaking heat wave destroyed raspberry and blackberry harvests, slashed Christmas tree yields by 70 percent, and contributed to a 21–24 percent increase in forest area burned across North America.

In India, the 2022 heat wave devastated crops: wheat yields dropped by 9–34 percent in over a third of states, dairy animals produced up to 15 percent less milk, and cabbage and cauliflower yields were halved. Even in Kyrgyzstan’s Fergana mountain range, known for its year-round snow, spring temperatures surged, signaling a dramatic shift in traditional growing conditions.

El Niño and La Niña: The Climate Cycles Amplifying the Crisis

The report underscores how natural climate cycles like El Niño and La Niña are intensifying the impact of extreme heat on agriculture. Brazil, a top global exporter, is particularly vulnerable to these oscillations, which exacerbate droughts, floods, and temperature swings. The findings serve as a wake-up call for policymakers, farmers, and consumers alike, highlighting the urgent need to adapt food production systems to a warming world.

Key Takeaways from the UN Report

• Brazil’s agricultural losses: Soy, corn, coffee, and livestock severely impacted by extreme heat and flooding.
• Global disruptions: Salmon farms in Chile, raspberry harvests in the U.S., and wheat yields in India all face severe threats.
• Climate cycles at play: El Niño and La Niña are amplifying heat waves and weather extremes, destabilizing food systems.
• Call to action: The report outlines strategies for resilient food production in a climate-changed world.

"The compounding effects of extreme heat on agriculture are undeniable. This report is a critical tool for understanding how to produce food in a world where heat extremes are becoming the baseline."