# Heatwaves reveal vulnerabilities in global food systems Extreme heat disrupts food supply chains from farms to supermarkets - **Source:** [Nature](https://brifing.si/source/4d850c3b-dd79-4024-bc91-db2571889199) - **Published:** 2026-08-18 - **Topic:** [Business](https://brifing.si/c/business) - **Original article:** - **On Brifing:** https://brifing.si/s/d6b8efc2-b5ef-4114-b0a6-599e4f9e8309 ## Unexpected bottlenecks in food systems The heatwaves of June-July 2023 exposed vulnerabilities not just at farms but throughout entire food supply chains. In France, mass poultry deaths overwhelmed carcass disposal systems. UK supermarkets faced refrigeration failures that jeopardized frozen food stocks. Experts warn climate change-induced temperature rises could make such crises more frequent. The events revealed systemic weaknesses in how food systems handle extreme weather shocks beyond agricultural production. ## Poultry catastrophe in France As temperatures exceeded 40°C in parts of France, poultry began dying en masse from heat stress. Livestock farms struggled with mortality rates five times above normal. Carcass collection services operated beyond capacity. Authorities warned delayed disposal created public health risks. The crisis exposed France's unprepared livestock infrastructure for climate shocks, particularly in older poultry housing not designed for current temperature extremes. ## UK cold chain breakdown Supermarket refrigeration systems failed across England during peak heat. Some stores emptied frozen food sections entirely. Delivery disruptions also affected fresh produce availability. Retailers deployed emergency generators but some areas experienced up to 48-hour outages. Food safety experts emphasize cold chain infrastructure must be climate-proofed as heatwaves become more intense and frequent. The incidents showed how single points of failure can disrupt entire supply networks. ## Waste management collapse Heatwaves crippled waste management systems too. Refrigeration units in French garbage trucks malfunctioned. Some UK municipalities suspended organic waste collections. Landfill fire risks escalated dramatically. Officials reported food waste volumes increasing 30% faster than normal. These secondary effects demonstrated climate change's cascading impacts on food systems far beyond immediate agricultural production challenges. ## Livestock housing alarms Dairy farm cooling systems proved inadequate, with some milk yields dropping 40%. Pig farms saw elevated mortality rates. Animal welfare experts note most European livestock buildings predate current climate realities, particularly facilities built 1960-80s. The crisis revealed critical need for climate-adaptive housing redesigns including better ventilation, shade and emergency cooling capacity to prevent billions in losses during heat events. ## Retail stock crises Major UK supermarket chains faced empty shelves as supply chain disruptions hit simultaneously. Dairy, meat and frozen sections were hardest hit. Retailers paid premium prices for emergency deliveries. Industry groups estimated heatwaves added £200 million in annual costs, contributing to food price inflation. The events showed how climate shocks can create system-wide shortages when multiple nodes fail concurrently. ## Food price domino effect UK chicken prices rose 15% in one week, with dairy up 8%. Economists warn such climate-driven price spikes could become structural rather than temporary. Concerns grow about food access for low-income households as climate and energy crises compound. The heatwaves demonstrated how extreme weather can rapidly translate into economic shocks through interconnected food systems, with inflationary impacts lasting months beyond the actual weather event. ## Climate-resilient systems needed The crises revealed food systems' alarming lack of climate preparedness. Experts call for comprehensive supply chain resilience strategies including cold chain upgrades, emergency protocols and diversified sourcing. Without systemic adaptation, similar heatwaves will increasingly threaten food security. The 2023 events served as a wake-up call for governments and businesses to future-proof critical food infrastructure against intensifying climate disruptions. ## Sources covering this story - https://www.nature.com/articles/d41586-026-02577-3 — --- _Summary written by Brifing from the original reporting. Copyright in the original article belongs to its publisher; read the full piece at the link above._