Introduction:
Heatwaves in India are increasing in frequency, duration, and geographical spread, extending beyond traditional summer months. Rising temperatures, humidity, and warm nights indicate that heatwaves are no longer episodic events but systemic climate risks affecting multiple sectors.
Causes of Increasing Heatwaves:
- Climate Change: Rising global temperatures have elevated baseline heat, making extreme events more frequent and intense.
- El Niño & Atmospheric Conditions: Weak monsoon circulation and high-pressure systems reduce rainfall and trap heat.
- Soil Moisture Deficit: Reduced moisture lowers evaporative cooling, increasing surface temperatures.
- Urban Heat Island Effect: Concrete surfaces, reduced greenery, and waste heat make cities significantly hotter.
- Weak Western Disturbances: Reduced cloud cover and rainfall lead to faster heating of land.
- Rising Humidity & Night Temperatures: Limit physiological recovery, increasing heat stress.
Impacts of Heatwaves:
- Human Health: Increased heat-related illnesses and deaths, especially among vulnerable groups like the elderly, children, and outdoor workers.
- Economic Losses: Reduced labour productivity and increased energy demand strain the economy.
- Agriculture & Food Security: Heat stress affects crop yields, livestock productivity, and fisheries.
- Water Stress: Higher evaporation and demand intensify scarcity.
- Urban Stress: Infrastructure damage and power shortages create a “heat–power trap.”
- Environmental Impact: Increased forest fires and ecosystem degradation.
Policy Gaps in India’s Heatwave Response:
- Uneven Heat Action Plans (HAPs): Lack of standardisation and weak implementation across states.
- Data Deficiency: Underreporting of heat-related mortality limits effective policy design.
- Poor Vulnerability Mapping: Insufficient focus on localised, high-risk populations.
- Urban Planning Failures: Limited adoption of cooling strategies like green spaces and cool roofs.
- Fragmented Governance: Weak coordination among health, urban, and disaster management agencies.
- Reactive Approach: Focus on short-term warnings rather than long-term climate resilience.
- Low Awareness: Inadequate public preparedness and behavioural adaptation.
Conclusion:
Heatwaves represent a structural governance and climate challenge requiring integrated policy action. A shift towards long-term adaptation, climate-resilient infrastructure, and targeted protection of vulnerable groups is essential to mitigate their growing impact.
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