High heat: On India and warming
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500+ questions on Environment with explanations
📌 Summary:
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Context: India's summer heat arriving noticeably early in 2026; IMD issued heat alerts in Vidarbha, Chhattisgarh, Odisha, Telangana, Kerala, Andhra Pradesh, Gujarat, Tamil Nadu, Karnataka — typically a May-June phenomenon now appearing in April
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Coastal areas face compounded risk: humidity + heat creates dangerous "feels-like" temperatures; urban heat island effect worsens urban centres
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Warmer nights delay physiological recovery and increase healthcare burden
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Causal chain: (1) Lack of western disturbances and thunderstorms → no pre-monsoon cooling events (2) Reduced convective activity → heat accumulation (3) Residual El Niño effects → above-normal sea surface temperatures feeding into India's warming (4) Urban Heat Island effect → cities retain far more heat than surrounding areas (5) Long-term structural factor: climate change making pre-monsoon heatwaves larger and more intense
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Agricultural implications: persistently high heat → depleted soil moisture → reduced crop yields → food security risk before kharif monsoon
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Occupational health: outdoor workers (construction, agriculture, sanitation) face acute risk; adequate protections rare in India
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India's vulnerability: large outdoor workforce; inadequate heat action plans in tier-2/3 cities; weak early warning dissemination to last-mile workers
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Solutions: Strengthen Heat Action Plans at city and district level; improve early warning systems; urban greening and cool roofs; worktime restrictions during peak heat hours
🎯 UPSC Relevance: GS3 – Environment: Climate Change, heatwaves; GS1 – Geography: Climatology, Indian weather; GS3 – Disaster Management: heat preparedness; GS2 – Governance: urban heat management
📝 Prelims Facts:
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El Niño: warming of central/eastern Pacific Ocean; weakens Indian monsoon and raises summer temperatures
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Western disturbances: extratropical cyclonic systems from Mediterranean providing pre-monsoon cooling in NW India
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Urban Heat Island (UHI): urban areas significantly warmer than surroundings due to concrete, reduced vegetation, waste heat
🔑 Key Term: Heat Action Plan (HAP) – city-level preparedness framework to reduce heatwave mortality; includes early warning, cooling centres, health advisories, inter-agency coordination; India's HAP coverage remains uneven across states
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