The joint report by Food and Agriculture Organization and World Meteorological Organization highlights that rising heatwaves are emerging as a critical threat to global agriculture and livelihoods, with particularly severe implications for climate-sensitive countries like India.
The report warns that by the end of the century, agricultural workers in South Asia, tropical sub-Saharan Africa, and parts of Central and South America may face up to 250 days annually of extreme heat conditions, making sustained physical labour nearly impossible.
Concept of Extreme Heat
The World Meteorological Organization defines heatwaves as prolonged periods of abnormally high temperatures, lasting from several days to months, where both daytime and nighttime temperatures exceed normal regional averages.
Such extreme heat creates biological stress across ecosystems, adversely affecting crops, livestock, fisheries, forests, and human health.
Rising Heatwave Trends and Biological Impact
Over the past 50 years, heatwaves have increased significantly in frequency, intensity, and duration.
- Rising temperatures reduce the thermal safety margin essential for biological processes
- Critical functions such as photosynthesis (plants), reproduction (animals), and survival mechanisms are adversely affected
- This leads to declining productivity across ecosystems and increased vulnerability of agrifood systems
Impact on Agriculture and Livestock
Impact on Crops
- Temperatures above 30°C reduce crop yields
- Heat damages plant structures, disrupts pollination, and induces toxic stress
- Crop productivity declines significantly under sustained heat exposure
Impact on Livestock
- Heat stress begins at around 25°C
- Initial responses include reduced activity and seeking shade
- Prolonged exposure leads to dehydration, organ failure, and mortality
- Even survival conditions result in reduced milk yield and quality
This is particularly critical for countries like India where agriculture is highly climate-dependent.
Key Findings for India
The report identifies India as one of the most vulnerable countries to extreme heat.
- Severe risks to agriculture and rural livelihoods
- Rice production in the Ganga and Indus basins is particularly threatened
- High population density amplifies the socio-economic impact
Global Findings
Widespread Impact
- Extreme heat threatens over 1 billion people globally
- Causes nearly half a trillion work hours lost annually
- Severely damages crops, livestock, fisheries, and forestry systems
Increasing Instability
- Heatwaves are becoming more frequent and intense
- Agrifood systems are increasingly unstable and climate-vulnerable
Risk Multiplier Effect
- Intensifies water stress and flash droughts
- Increases wildfire risks
- Accelerates spread of pests and crop diseases
Physiological Stress
- Disrupts growth, reproduction, and survival across biological systems
- Reduces productivity of plants, animals, and ecosystems
Human Labour Crisis
- Agricultural labour productivity declines sharply
- Up to 250 days/year too hot to work in some regions
- Direct threat to rural livelihoods and food security
Recommendations and Solutions
The report proposes multi-dimensional adaptation strategies:
Climate-Resilient Agriculture
- Adjust planting schedules
- Improve water management systems
- Adopt heat-resistant crop and livestock varieties
Early Warning Systems
- Strengthen heatwave forecasting and alerts
- Enable timely actions such as irrigation and livestock protection
Financial and Social Protection
- Expand climate insurance and cash transfers
- Implement shock-responsive social protection systems
Technological Innovation
- Promote selective breeding and climate-resilient crops
- Improve farm management practices
Strengthening Rural Capacity
- Address gaps in awareness, training, and climate information access
- Focus on low- and middle-income countries like India
Global Cooperation
- Enhance international collaboration
- Accelerate climate action and emission reduction
- Transition to low-carbon, climate-resilient agriculture systems
Key Call to Action
The report emphasizes that:
- Adaptation requires innovation in crop selection, breeding, and farm practices
- Early warning systems are essential tools for farmers
- Financial access and social protection underpin resilience strategies
- Technical solutions alone are insufficient without addressing socio-economic barriers such as limited awareness, education, and institutional support
About FAO
- Established: 1945
- Type: UN specialized agency
- Headquarters: Rome, Italy
- Members: 194 (193 countries + EU); India is a founding member
- Key Reports: State of World’s Forests, State of Food and Agriculture
About WMO
- Established: 1950
- Origin: Successor of International Meteorological Organization
- Headquarters: Geneva, Switzerland
- Members: 193 (187 states + 6 territories)
- Role: Global coordination in meteorology, hydrology, and climate science
- Key Initiative: Co-founder of Intergovernmental Panel on Climate Change with