Climate-Disaster Nexus — Heat Waves, GLOFs, Compound Disasters & Adaptation

Climate Change and Disaster Intensification — The Nexus

Climate change is not a future threat — it is a disaster multiplier already reshaping the frequency, intensity, and geographic spread of natural hazards. The IPCC Sixth Assessment Report (AR6) provides the most comprehensive scientific evidence of this nexus.

IPCC AR6 — Key Findings

The AR6 was released in stages: Working Group I (August 2021), Working Group II (February 2022), Working Group III (April 2022), and the Synthesis Report (March 2023).

For Mains: IPCC AR6 establishes "unequivocal" human influence on climate warming. The frequency and intensity of heavy precipitation events have "likely increased" at the global scale over a majority of land regions. This forms the scientific basis for all climate-disaster policy arguments.

How Climate Change Intensifies Different Disasters

Heat Waves in India

IMD Criteria for Heat Wave Declaration

Heat Wave Mortality and Trends

Heat Action Plans (HAPs)

India's Heat Action Plans are the primary policy response to heat waves, implemented in collaboration with IMD, NDMA, and state/local health departments.

For Mains: Evaluate the effectiveness of Heat Action Plans in India. While Ahmedabad's HAP reduced heat mortality by 25-40%, most state HAPs lack enforcement mechanisms, budgetary allocation, and real-time monitoring of vulnerable populations. The absence of a national heat law (unlike cold wave provisions under NDMA) is a significant gap.

Glacial Lake Outburst Floods (GLOFs)

What is a GLOF?

A GLOF occurs when water dammed by a glacier or moraine (glacial debris) is released suddenly, causing catastrophic downstream flooding. Climate change accelerates glacier retreat, creating new and expanding existing glacial lakes — increasing GLOF risk.

Chamoli Disaster (7 February 2021)

Sikkim GLOF (3-4 October 2023)

Prelims Fact: South Lhonak Lake expanded from 0.2 sq km in 1976 to 1.67 sq km in 2023 due to glacier retreat. ICIMOD monitors glacial lakes across the Hindu Kush Himalaya for GLOF risk.

ICIMOD and GLOF Monitoring

Urban Flooding — Chennai 2015 and Mumbai 2005

Mumbai Floods (26 July 2005)

Chennai Floods (November-December 2015)

Lessons from Urban Flooding

For Mains: Urban flooding is a governance failure as much as a natural disaster. The Mithi River in Mumbai and Pallikaranai Marsh in Chennai were systematically encroached upon. Discuss how the convergence of climate change (more intense rainfall) and poor urban planning creates compound disaster risks.

Compound and Cascading Disasters

What Are Compound Disasters?

Compound disasters involve two or more hazards occurring simultaneously or sequentially, where the combined impact is greater than the sum of individual events.

Cloud Bursts in the Himalayas

Loss and Damage Fund (COP28)

Background

Loss and damage refers to climate change impacts that cannot be addressed by mitigation or adaptation — the unavoidable residual harm suffered by vulnerable countries and communities.

COP28 Operationalisation (December 2023)

Key Financial Pledges

For Mains: The Loss and Damage Fund represents a breakthrough in climate justice but faces significant challenges. Total pledges (USD 661 million) are a fraction of estimated loss and damage in developing countries (USD 400 billion/year by 2030). Discuss the equity implications — developing countries have contributed least to emissions but suffer the most. India has advocated strongly for this fund at multiple COPs.

Coalition for Disaster Resilient Infrastructure (CDRI)

Overview

CDRI Objectives

Prelims Fact: CDRI was launched by India in September 2019 at the UN Climate Action Summit. Its headquarters are in New Delhi. IRIS (Infrastructure for Resilient Island States) was launched at COP26 in 2021.

Climate Adaptation Framework in India

National Action Plan on Climate Change (NAPCC)

State Action Plans on Climate Change (SAPCC)

National Adaptation Fund for Climate Change (NAFCC)

Adaptation vs Mitigation — A Comparative Framework

For Mains: India's position at climate negotiations has consistently emphasised that adaptation must receive equal priority and funding as mitigation. The principle of Common but Differentiated Responsibilities (CBDR) demands that developed countries, as historical emitters, fund adaptation in vulnerable developing countries. Discuss this in the context of the Loss and Damage Fund.

Climate-Resilient Infrastructure

Principles

Key Indian Initiatives

Recent Developments (2024–2026)

India's 2024 Climate-Disaster Record — 322 Extreme Weather Days

CSE and Down to Earth's 2024 Annual Report on Extreme Weather documented India experiencing extreme weather on 322 days in 2024 — the highest frequency recorded. Fatalities: 3,472 (15% increase over 2023). Agricultural damage: 4.07 million hectares of cropped land affected (84% increase). The region-by-region breakdown shows: Central India (Maharashtra, Madhya Pradesh) — 253 extreme weather days with highest crop damage; North-East and East — most flood deaths; South India — Wayanad landslide as the single deadliest event.

The data directly demonstrates the climate-disaster nexus: each of the major hazard categories (floods, heat waves, cyclones, landslides, droughts) showed higher frequency and/or intensity in 2024 compared to the 2011–2020 baseline period. India's NDC (Nationally Determined Contribution) update to UNFCCC in 2022 explicitly acknowledges increased disaster frequency as a climate adaptation challenge, linking DRR to climate action.

UPSC angle: Prelims — CSE/DTE State of Extreme Weather Report 2024; 322 extreme weather days; 3,472 deaths; 4.07 mn ha cropped area. Mains (GS3) — data-driven climate-disaster nexus analysis; NDC-DRR integration; adaptation as DRR.

Loss and Damage Framework — COP28 and India's Position (2023–2024)

COP28 (Dubai, December 2023) operationalised the Loss and Damage Fund — agreed in principle at COP27 (Sharm el-Sheikh, 2022). The Fund specifically addresses the irreversible losses and damages from climate change that cannot be adapted to — including extreme weather events. The World Bank was designated as the interim trustee. Pledges at COP28 totalled approximately USD 700 million — widely considered inadequate given annual climate-related disaster losses in developing countries exceeding USD 150 billion.

India's position at COP28: supported the Loss and Damage Fund but insisted on differentiated responsibility (historical emitters must contribute more) and opposed any language suggesting developing countries' voluntary contributions. India was among the first countries to formally call for "loss and damage" recognition at COP-13 (Bali, 2007). The CDRI framework and MISHTI scheme represent India's domestic integration of climate resilience into DRR.

UPSC angle: Prelims — Loss and Damage Fund: COP27 agreed, COP28 operationalised; World Bank trustee; USD 700 million pledged. Mains (GS3/IR) — loss and damage vs adaptation vs mitigation; India's climate diplomacy; equity dimension of climate finance.

Compound Disasters — Emerging Threat in India (2024–2025)

India is increasingly experiencing "compound disasters" — where two or more hazards occur simultaneously or sequentially, amplifying impacts beyond what either event would cause alone. Examples from 2024: Wayanad — extreme rainfall + land instability + flash flood (compound event causing 400+ deaths); Northeast India monsoon 2024 — simultaneous flooding of Brahmaputra tributaries + landslides in Meghalaya + cyclonic rainfall (Assam, Mizoram) — creating a simultaneous multi-state crisis.

NDMA's draft guidelines on compound disaster preparedness (2024) acknowledge that existing hazard-specific response protocols are inadequate for compound events. The proposed DM Act Amendment (2024) includes "compound disasters" as a new category requiring specific inter-ministry response protocols. Scientists at IIT Delhi and ICIMOD published a 2024 paper mapping India's highest compound-disaster risk zones — including Northeast India (Brahmaputra valley), coastal Odisha (cyclone + storm surge + river flooding), and the Hindukush-Himalaya (GLOF + flash flood + landslide cascade).

UPSC angle: Prelims — compound disasters; NDMA draft guidelines 2024; ICIMOD (International Centre for Integrated Mountain Development). Mains (GS3) — compound disaster governance gap; multi-hazard early warning systems; institutional coordination for concurrent crises.

Exam Strategy

Prelims Focus Areas

• IPCC AR6: released 2021-2023; key finding that human influence is "unequivocal"
• IMD heat wave criteria: 40 degrees C plains, 30 degrees C hills, departure of 4.5 degrees C
• Chamoli 2021: rock-ice avalanche from Ronti Peak (not a GLOF), 204 missing
• Sikkim 2023: South Lhonak Lake GLOF, 1,200 MW Teesta III dam destroyed
• CDRI: launched 2019, HQ New Delhi, 12 founding members, IRIS initiative at COP26
• Loss and Damage Fund: operationalised COP28 (2023), World Bank as interim host, USD 661 million pledged
• NAPCC: 2008, 8 missions; NAFCC: 2015, NABARD as NIE, 30 projects in 27 States
• SAPCC: 34 States/UTs have prepared plans

Mains Answer Frameworks

Q: "Climate change is a threat multiplier for disaster risk. Examine with reference to recent Indian experiences."

Structure:

1. Climate-disaster nexus — IPCC AR6 evidence
2. Heat waves — increasing mortality, IMD data, HAP limitations
3. GLOFs — Chamoli 2021, Sikkim 2023 as case studies
4. Urban flooding — Chennai 2015, Mumbai 2005 — climate + governance failure
5. Compound disasters — cascading events, cloud bursts + construction
6. Way forward — CDRI, climate-resilient infrastructure, early warning, NAFCC

Q: "Evaluate the effectiveness of India's institutional framework for climate adaptation."

Structure:

1. NAPCC and 8 missions — design vs implementation gap
2. SAPCCs — coverage (34 States) but poor execution
3. NAFCC — 30 projects, limited scale
4. CDRI — global leadership but domestic application needs strengthening
5. Loss and Damage Fund — international advocacy vs domestic preparedness
6. Way forward — dedicated adaptation finance, climate risk in all infrastructure, community-based adaptation

Key Terms

Climate Risk

• Definition: The probability of harmful consequences — loss of life, injury, infrastructure damage, livelihoods disruption — arising from the interaction of climate hazards (heatwaves, floods, cyclones, droughts) with the vulnerability and exposure of people and systems.
• Origin: IPCC AR6 (2021–22) framing; Climate Risk = Hazard × Exposure × Vulnerability; used in the Loss & Damage discourse at UNFCCC COP meetings.
• UPSC: IPCC's AR6 framework; India's climate vulnerability (coasts, Himalayan glaciers, agriculture); Loss and Damage Fund established at COP27 (2022) and operationalised at COP28 (2023).

Compound Events

• Definition: Climate-related events that combine multiple hazards simultaneously or sequentially (e.g., drought followed by wildfire, heatwave during a flood) producing impacts greater than individual events would cause.
• Origin: IPCC AR6 Special Report on Extremes (SREX); increasingly relevant as climate change intensifies overlapping risks.
• UPSC: GS1 climate questions; India examples — Cyclone + coastal flooding + storm surge; heat + humidity (wet-bulb temperature exceeding human tolerance); relevant for NDMA planning.

Nature-Based Solutions (NbS)

• Definition: Actions that protect, sustainably manage, or restore natural and modified ecosystems to address societal challenges (including disaster risk and climate adaptation) while providing human well-being and biodiversity benefits.
• Origin: IUCN definition; mainstreamed in global climate discussions; India's initiatives — mangrove restoration for coastal protection, wetland restoration for flood buffering.
• UPSC: Relevant for DRR and climate adaptation; India's mangrove cover; Coastal Regulation Zone and mangrove protection; contrast with grey infrastructure (seawalls).

Loss and Damage

• Definition: The residual negative impacts of climate change that cannot be avoided through mitigation or adapted to — including both economic losses (infrastructure, crops) and non-economic losses (cultural heritage, biodiversity, loss of life).
• Origin: Warsaw International Mechanism (WIM, COP19, 2013); Santiago Network (COP25, 2019); Fund agreed at COP27 (Sharm el-Sheikh, 2022); Fund for Responding to Loss and Damage (FRLD) fully operationalised at COP29 (Baku, November 2024) — Philippines is host country; World Bank is interim trustee; Executive Director: Ibrahima Cheikh Diong.
• UPSC: Total pledges ~$768 million (far below the hundreds of billions needed annually); US withdrew from the Fund in early 2025 (Trump administration, walked back $17.5M pledge); $250 million start-up package approved April 2025; India's position — historical emitters must contribute; India is both a vulnerable nation and a major emitter; equity dimension of climate finance.

Heat Island Effect

• Definition: The phenomenon where urban areas experience significantly higher temperatures than surrounding rural areas due to dark impervious surfaces, reduced vegetation, waste heat from vehicles and air conditioning, and reduced evapotranspiration.
• Origin: Documented since the early 19th century; increasingly severe with urban expansion; relevant to India's heatwave-urban interaction.
• UPSC: Heatwave definition (IMD — temperature ≥40°C in plains; ≥30°C in hills; or 4.5°C above normal); Heat Action Plans (Ahmedabad's HAP was India's first, 2013); NDMA heatwave guidelines.