Rising temperatures put India’s rice farming at risk, says FAO-WMO report

A joint report by the Food and Agriculture Organization (FAO) and the World Meteorological Organization (WMO) — titled "Extreme Heat and Agriculture" — has f...

What Happened

A joint report by the Food and Agriculture Organization (FAO) and the World Meteorological Organization (WMO) — titled "Extreme Heat and Agriculture" — has found that rising temperatures are placing India's rice farming at serious risk, with the Indian subcontinent expected to experience more frequent and more intense high-temperature extremes.
The report identifies the Indo-Gangetic Plain — covering much of northern India, including major rice-growing states — as among the most vulnerable zones globally, combining high population density, intensive farming, and increasing heat stress.
Rice yields are estimated to decline by approximately 1.2 percent (±5.2%) per 1°C of warming globally, with losses compounding under compound heat-drought events that can push yield reductions beyond 30 percent.
Wheat is even more sensitive: the report estimates a -6.0 percent (±3.3%) yield decline per 1°C of warming — directly relevant for India's rabi food security.
Extreme heat during rice's reproduction and grain-filling stages causes flower abortion, poor grain formation, and irreversible reproductive damage. These processes occur within narrow temperature windows (typically above 35–38°C) that are being exceeded with increasing frequency across Indian cropping zones.
Agricultural labour capacity is projected to fall by up to 33 percent globally under high-emission scenarios, with South Asia and tropical Sub-Saharan Africa among the most affected. By 2100, the number of days per year too hot to safely perform outdoor farm work could reach 250 in much of South Asia.
The global economy already loses approximately 500 billion work-hours annually to heat stress — a figure that will rise sharply with continued warming.
Agrifood systems supporting 1.23 billion livelihoods worldwide are identified as at risk from extreme heat.
The report recommends: heat-tolerant crop varieties, adjusted planting calendars, expanded irrigation, and early warning systems that allow farmers to shift schedules and protect livestock before extreme events arrive.

Static Topic Bridges

Rice as a Strategic Crop for India

Rice is India's most important kharif staple — a food security and livelihood crop simultaneously. India is both the world's largest rice exporter and home to hundreds of millions of subsistence rice farmers.

India accounts for approximately 40 percent of global rice exports in recent years, exporting over 20 million tonnes annually.
Major rice-producing states: West Bengal, Uttar Pradesh, Punjab, Andhra Pradesh, Telangana, Odisha, Bihar, Chhattisgarh.
The Indo-Gangetic Plain (IGP) — stretching from Punjab through Haryana, UP, Bihar, and West Bengal — produces the bulk of India's rice in irrigated and rain-fed systems.
Rice is sensitive to heat stress at three critical growth stages: panicle initiation (about 10 days before heading), anthesis/flowering (heat above 35°C for even 1 hour during this stage causes spikelet sterility), and grain filling.
India currently cultivates approximately 44 million hectares under rice annually, with average national yields of approximately 2.8–3.0 tonnes per hectare.

Connection to this news: The FAO-WMO report's finding that high temperature extremes are becoming more frequent and intense across the Indian subcontinent directly threatens the phonological windows during which rice is most heat-vulnerable, with disproportionate impact on the IGP — India's rice bowl.

The FAO-WMO Joint "Extreme Heat and Agriculture" Report

The report, released in April 2026, is a joint publication of two UN specialised agencies: FAO (Food and Agriculture Organization) and WMO (World Meteorological Organization). It synthesises global scientific evidence on the intersection of extreme heat and agrifood systems.

FAO (est. 1945): mandated to achieve food security for all; headquartered in Rome.
WMO (est. 1950): mandated for meteorology and climate; headquartered in Geneva.
The report covers impacts across multiple dimensions: crop yield, livestock, fisheries, agrifood labour, and supply chain logistics.
The report quantifies that extreme heat has already caused half a trillion (500 billion) work-hours to be lost annually worldwide.
Under high-emission scenarios (approximately 3–4°C warming), agricultural labour capacity could fall by up to 33 percent globally; South Asia faces the most severe exposure.
The report recommends an adaptation pathway combining genetic innovation (heat-tolerant varieties), agronomic adjustments (planting calendar shifts, mulching, irrigation), and systemic investment in early warning systems.

Connection to this news: The joint FAO-WMO framing elevates this beyond a scientific finding — it is an intergovernmental policy signal that food systems must integrate heat risk management at national and subnational levels.

Heat Stress Physiology in Rice and Wheat

Understanding why temperature increases reduce crop yields requires recognising the biological sensitivity of reproductive stages — facts directly examinable in UPSC Mains.

Rice: The critical heat threshold is approximately 35–38°C during anthesis. Spikelet sterility (failure of pollen to germinate) occurs rapidly above this temperature, reducing grain set. Heat during grain filling causes chalkiness (white belly defect), reducing quality and market value.
Wheat: Heat stress during grain filling (approximately February–March in India) causes premature maturation and reduced starch accumulation — "shrivelling." The current crop damage from unseasonal rains is partly a weather-analogue of this biological vulnerability window.
Compound events: When heat stress coincides with drought (reduced soil moisture), the combined yield impact is non-linear — research shows compound heat-drought events can push yield losses to over 30 percent, compared to 10–15 percent for heat or drought alone.
Wet-bulb temperature: The combined measure of heat and humidity; above a wet-bulb temperature of 32–35°C, outdoor physical labour becomes physiologically dangerous for humans regardless of adaptation.

Connection to this news: India's rice belt in the IGP already experiences wet-bulb temperatures exceeding human comfort thresholds during peak summer; the projected increase in frequency and intensity of heat extremes compresses both the safe growing window for rice and the safe working window for farmers.

Climate Adaptation Policy in Indian Agriculture

India has committed to climate adaptation in agriculture through several frameworks, though implementation gaps remain significant.

National Mission for Sustainable Agriculture (NMSA): One of the eight missions under the National Action Plan on Climate Change (NAPCC); focuses on water-use efficiency, soil health, and climate-resilient varieties.
ICAR (Indian Council of Agricultural Research): Has developed over 1,500 climate-resilient crop varieties, including heat-tolerant rice varieties (e.g., Sahbhagi Dhan for drought tolerance; varieties under DRR 44, DRR 46 series for heat).
PM-Fasal Bima Yojana: India's primary crop insurance scheme; however, heat and drought events are not always well-captured by area-based yield trigger mechanisms in time for meaningful farmer compensation.
Early Warning Systems: The IMD's Agro-Meteorological Advisory Services provide block-level weather forecasts to farmers; expanding this to heat-stress specific advisories is a key adaptation need identified in the FAO-WMO report.

Connection to this news: The FAO-WMO report's recommendations align with existing Indian policy frameworks but underscore the need for accelerated implementation and scaling — particularly of early warning systems and heat-tolerant variety adoption — given the compressed timeline indicated by current warming trajectories.

Key Facts & Data

Rice yield sensitivity to warming: -1.2% (±5.2%) per 1°C of warming
Wheat yield sensitivity to warming: -6.0% (±3.3%) per 1°C of warming
Compound heat-drought yield loss: can exceed 30 percent for rice and wheat
Agricultural labour capacity reduction by 2100 (high emission): up to 33 percent globally
Days too hot for safe outdoor farm work by 2100 (South Asia, high emission): up to 250 days/year
Work-hours already lost annually to heat stress globally: ~500 billion
Agrifood livelihoods at risk globally: 1.23 billion people
Critical heat threshold for rice anthesis: 35–38°C (causes spikelet sterility)
India's rice cultivation area: approximately 44 million hectares
India's rice export share: approximately 40 percent of global rice exports (recent years)
Key vulnerable region: Indo-Gangetic Plain (Punjab, Haryana, UP, Bihar, West Bengal)
FAO established: 1945 (Rome); WMO established: 1950 (Geneva)
India's NAPCC missions relevant to agriculture: NMSA (National Mission for Sustainable Agriculture)
ICAR heat-tolerant rice varieties: over 1,500 climate-resilient varieties developed across crops