FAO-WMO Report Sounds Alarm on Extreme Heat's Devastating Impact on Global Agriculture
A groundbreaking joint report from the Food and Agriculture Organisation (FAO) and the World Meteorological Organisation (WMO), released on Wednesday to coincide with Earth Day, reveals that extreme heat is rapidly emerging as a critical threat to global food systems, agricultural livelihoods, and worker productivity. The report, titled 'Extreme Heat and Agriculture', places agricultural communities squarely on the front lines of this escalating climate crisis.
Heat as a 'Risk Multiplier' for Agrifood Systems
The comprehensive analysis highlights the intricate links between climate change, food security, agriculture, and ecosystem health. It issues a stark warning that risks to agrifood systems and ecosystems are poised to soar in the coming years. This projection is based on the sharp increase in the frequency, intensity, and duration of extreme heat events observed over the past five decades.
FAO Director-General Qu Dongyu described extreme heat as a "risk multiplier" that is exerting growing pressure on crops, livestock, fisheries, and forests. This pressure extends to the communities and economies that are fundamentally dependent on these vital resources for survival and prosperity.
WMO Secretary-General Celeste Saulo emphasized that extreme heat is increasingly defining the operational conditions for agrifood systems worldwide. "More than an isolated climatic hazard, it acts as a compounding risk factor that magnifies existing weaknesses across agricultural systems," Saulo stated. She underscored the critical importance of early warnings and climate services, such as seasonal outlooks, to help humanity adapt to this new and challenging reality.
Detailed Impacts and Critical Temperature Thresholds
The joint report meticulously details the physical science of extreme heat, system vulnerabilities, observed and projected impacts on agriculture, adaptation strategies, case studies, and essential policy recommendations. It clarifies that the impact of extreme heat events is highly relative, depending significantly on the specific context of when and where they occur.
The document establishes clear biological thresholds:
- For the most common livestock species, heat stress begins to manifest when temperatures exceed 25°C.
- For the majority of agricultural crops, yields start to decline above 30°C, with this limit being even lower for sensitive crops like potatoes and barley.
The report also presents alarming evidence of a strong correlation between intense heatwaves and the increased incidence of devastating wildfires. Furthermore, it highlights the direct danger to human health, noting that extreme heat is severely affecting farm workers. In many parts of South Asia, for instance, the number of days annually that are too hot for safe outdoor work could rise to a staggering 250 days.
Compounding Risks and the Path to Adaptation
Extreme heat is dangerous not only as a standalone phenomenon but because it dramatically worsens other critical risks. These include water stress, flash droughts, wildfires, and the accelerated spread of pests and plant diseases. The report provides a thorough examination of these linked effects, including lesser-known threats like flash droughts, which are driven by sudden and severe temperature spikes.
To combat these challenges, the report strongly advocates for innovation and the implementation of robust adaptive measures. Key strategies highlighted include:
- Selective breeding for heat-resistant crop and livestock varieties.
- Adopting climate-suited crop choices and adjusting traditional planting windows.
- Improving farm management practices to better protect yields from thermal stress.
The development and deployment of early warning systems are identified as vital tools to help farmers proactively respond to impending extreme heat events. Crucially, the report emphasizes that access to financial services—including cash transfers, agricultural insurance, payment schemes, and shock-responsive social protection programs—forms the essential foundation that underpins all categories of adaptation options.
A Call for Global Solidarity and Decisive Action
The report concludes with a powerful call to action. It states that protecting the future of global agriculture and ensuring long-term food security will require a multi-faceted approach. This must involve not only building resilience at the farm level but also exercising international solidarity and collective political will for effective risk sharing. Most importantly, the authors stress the urgent need for a decisive and rapid global transition away from a high-emissions future to mitigate the root causes of this escalating threat.
