UPSC Relevance
- GS Paper 1: Geography – Climate Change, Heatwaves, Urban Heat Islands
- GS Paper 2: Health & Governance – Disaster Preparedness, Urban Planning
- GS Paper 3: Environment & Ecology – Climate Adaptation, Mitigation Strategies
- Essay/Ethics: Human vulnerability, climate justice, adaptation challenges
India is witnessing a surge in extreme heat events, driven by the Heat Dome Effect, Urban Heat Island (UHI) effect, and climate change. Heat domes occur when high-pressure systems trap hot air, leading to prolonged heatwaves. Coupled with rapid urbanization, loss of vegetation, and global warming, Indian cities are projected to face record-breaking heat events, with temperatures possibly exceeding 50°C in 2024–25. This has profound implications for health, agriculture, water security, and urban resilience.
Key Features and Recent Findings
- Heat Dome Effect: Traps warm air, causing sustained and extreme heat.
- Urban Heat Island Effect: Urban areas record 6–8°C higher than rural surroundings.
- Climate Change: Intensifies and prolongs heatwaves, making them more frequent.
- Forecasts: Northwestern India (Rajasthan, Gujarat, Punjab) and cities like Delhi, Hyderabad may see extreme events lasting up to 45 days.
- Health Impacts: Elderly, outdoor workers, and low-income groups face heightened mortality risks.
Case Studies & Research
- Ravindra et al., 2024: Heatwaves will exceed 50°C in parts of India; adaptation via cool roofs, urban greening essential.
- Matthews et al., 2025: India among most affected globally; parallels with Nigeria’s 2024 heat event causing 2,200+ deaths.
- Chen et al., 2023: UHIs worsen conditions in Delhi, Mumbai, Chennai, Bangalore; higher night-time temps increase health risks.
- Conlon et al., 2022: Hospitals unprepared; lessons from Canada’s 2021 heat dome stress need for cooling shelters, heat forecasting.
- Thompson et al., 2022: Canada’s 2021 heat dome (49.6°C, 600+ deaths) shows climate change has made such events 150× more likely.
Challenges
- Public Health Stress: Hospitals lack infrastructure for mass heat illness cases.
- Urban Planning Deficits: Dense concrete, poor ventilation, and limited green cover amplify heat.
- Agriculture & Water Security: Droughts, reduced yields, water scarcity intensify socio-economic distress.
- Energy Burden: Blackouts during peak demand worsen vulnerability.
- Social Inequality: Low-income groups lack cooling access, live in poorly ventilated homes.
Mitigation & Adaptation Strategies
- Strengthening Heat Action Plans (HAPs):
- AI-based forecasting, SMS alerts, early warning systems.
- Cooling centers, water distribution points for vulnerable groups.
- Emergency medical preparedness with trained staff and equipment.
- Urban Planning for Resilience:
- Expand green cover, urban forests, shaded streets.
- Mandate cool/reflective roofs and pavements.
- Promote permeable surfaces and reduced asphalt/concrete use.
- Climate Adaptation Policies:
- Aggressive shift to renewable energy and EVs.
- Improved irrigation and water harvesting systems.
- Resilient power grids, solar-powered cooling for low-income areas.
- Global Lessons:
- North America’s 2021 heat dome → early warnings, heat officers, infrastructure redesign.
- South America/Africa → urban greening reduced city temperatures by up to 5°C.
Conclusion
India’s heatwaves in 2024–25 are projected to be the most extreme in history. Without urgent interventions, rising mortality, collapsing agriculture, and infrastructure failures could destabilize the economy and public health. Heat domes, UHIs, and climate change together demand urgent adaptation policies, resilient urban planning, healthcare preparedness, and emission reductions. The crisis is preventable, but only if India acts now.