Climate Change and India's Changing Geography
Overview
Climate change is no longer a future threat for India — it is a present, measurable reality reshaping India's physical geography, agricultural productivity, water security, coastal stability, and human settlements. India is simultaneously one of the most climate-vulnerable major economies (due to its dependence on monsoon agriculture, long coastline, and Himalayan glaciers) and one of the world's largest emitters by absolute volume (3rd largest, behind China and USA).
For UPSC, climate change cuts across GS1 (physical geography changes), GS3 (environment, disaster management, economy), and Essay papers. This chapter maps the observed and projected changes on India's geography and the policy response.
Key Fact: India's average temperature has risen by ~0.89°C during 2015–2024 relative to the 1901–1930 baseline (PLOS Climate, 2024). Under mid-century scenarios, an additional 1.2–1.3°C warming is projected. India is warming faster than the global average in some regions.
Observed Climate Changes in India
Temperature
| Trend | Data |
|---|---|
| Overall warming | ~0.89°C rise (2015–2024 vs 1901–1930 baseline) |
| Hottest decade | 2010–2019 was India's warmest decade on record |
| Heat wave frequency | Significant increase; 2022 March–April heatwave was earliest on record |
| Night-time warming | Faster than daytime warming — reduced cooling effect |
| Himalayan warming | Hindu Kush Himalaya warming at ~0.28°C/decade (1950–2020) — faster than global average |
State-level hotspots:
- Rajasthan (Churu): Temperatures exceeding 50°C increasingly common
- Telangana, AP, Vidarbha: Severe pre-monsoon heatwaves; heat-related mortality rising
- Northeast India: Experiencing warming but also increased rainfall variability
Monsoon Changes
The southwest monsoon (June–September) shows complex, spatially variable trends:
| Observation | Detail |
|---|---|
| All-India average rainfall | Near-normal over 1901–2024 period overall; high inter-annual variability |
| Spatial shift | Decline in Indo-Gangetic plains and NE India; increase in central India (Madhya Pradesh, Chhattisgarh) |
| Extreme rainfall events | Increasing frequency — "wet spells wetter, dry spells drier" pattern |
| Flood frequency | Major urban floods: Mumbai (2005, 2017, 2024), Chennai (2015), Bengaluru (2022) — intensifying |
| Drought frequency | Severe droughts in 2002, 2009, 2014, 2018, 2023 |
| Onset delays | Increasing variability in monsoon onset dates |
UPSC Current Affairs: Indian Ocean warming and Indian Ocean Dipole (IOD) are increasingly influencing monsoon outcomes. 2024 saw above-normal rainfall overall but severe spatial maldistribution.
Glacier Retreat — Himalayan Crisis
India's ~9,575 glaciers (Himalayan and Karakoram) are retreating at an accelerating rate:
| Metric | Data |
|---|---|
| Warming rate (HKH) | ~0.28°C/decade (1950–2020) |
| Glacier mass loss 2000–2009 | −0.17 m water equivalent/year |
| Glacier mass loss 2010–2019 | −0.28 m w.e./year (accelerating) |
| Projected volume loss by 2100 | 30–50% reduction at 1.5–2°C warming; up to 70–80% at 4°C |
| Gangotri Glacier | Retreating ~22 m/year; Gaumukh snout has receded ~2 km since 1800s |
| Siachen Glacier | Some thinning despite high altitude |
Consequences of Glacier Retreat:
- Short-term: Glacial Lake Outburst Floods (GLOFs) — Chamoli disaster (February 2021, Uttarakhand) killed 200+; triggered by glacial lake/ice avalanche
- Medium-term: Increased summer river flow as glaciers melt faster → floods
- Long-term: Reduced perennial flow → seasonal water scarcity in Gangetic basin; "peak water" then decline
- Agricultural impact: ~500 million people depend on Himalayan meltwater for irrigation and drinking
Sea Level Rise and Coastal Changes
| Metric | Data |
|---|---|
| Sea level rise rate (north Indian Ocean) | 3.3 mm/year (1993–2017) |
| Extreme sea level events increase | 2–3 fold increase in extreme events |
| Arabian Sea cyclone intensity | Max pre-monsoon cyclone intensity increased 40% (1982–2019) |
| Projection | 100-year extreme sea level events → annual occurrences by mid-century (Arabian Sea coast) |
Most Vulnerable Indian Cities (coastal flooding):
- Mumbai: Low-lying Dharavi, coastal areas; sea wall protection inadequate for projected 0.5–1 m rise
- Kolkata: Gangetic delta; subsidence + sea level rise double threat; Sundarbans as buffer shrinking
- Chennai: Large stretches of Marina Beach area; 2015 floods as preview
- Kochi: Backwater network; already experiencing saltwater intrusion
Sundarbans:
- Rising sea levels + cyclone intensification → accelerating erosion of Sundarbans delta islands
- Ghoramara Island (WB): Lost ~50% land area since 1969; largely submerged by 2040 on current trajectory
- Lohachara Island: Already fully submerged — first inhabited island to disappear due to sea level rise
- Bhola Cyclone (1970), Sidr (2007), Amphan (2020), Remal (2024): Intensifying cyclones devastating Sundarbans and coastal WB/Odisha
Projected Changes — India's Climate Future
Temperature Projections (relative to 1995–2014 baseline)
| Scenario | Mid-century (2041–2060) | End-century (2081–2100) |
|---|---|---|
| SSP1-2.6 (Low emission) | +1.0–1.2°C | +1.0–1.5°C |
| SSP2-4.5 (Intermediate) | +1.2–1.3°C | +1.5–2.5°C |
| SSP5-8.5 (High emission) | +1.5–2.0°C | +3.0–4.5°C |
Monsoon Projections
- 6–8% increase in all-India mean SW monsoon rainfall by mid-century (models project)
- BUT: high spatial variability — some regions drier, some wetter
- Extreme rainfall events (>100 mm/day) projected to increase significantly
- Dry spells between rain events also projected to lengthen
Agricultural Impact Zones
| Region | Projected Impact |
|---|---|
| Indo-Gangetic Plain | Wheat yields declining 5–10% per 1°C warming; wheat belt shifting northward |
| Eastern India (rice) | Flooding and heat stress during reproductive phase; yield losses |
| Peninsular dryland | Kharif crops increasingly affected by erratic onset |
| Coastal agriculture | Salinisation of soils from seawater intrusion; cyclone damage |
India's Policy Response
India's NDC (Nationally Determined Contribution) — Updated 2022
India submitted its updated NDC to UNFCCC in August 2022:
| Target | Value | Timeline |
|---|---|---|
| Emissions intensity reduction | 45% reduction in GDP emissions intensity | By 2030 (from 2005 levels) |
| Renewable energy share | 50% of electric power from non-fossil fuels | By 2030 |
| Carbon sink enhancement | Create additional carbon sink of 2.5–3 billion tonnes CO₂ equivalent | Through forest/tree cover |
| Net-Zero target | Net-Zero emissions | By 2070 |
UPSC Fact: India's net-zero target of 2070 is later than USA (2050), EU (2050), and China (2060) — India justifies this citing its development needs and historically low cumulative emissions (per-capita emissions ~1/7th of USA).
National Action Plan on Climate Change (NAPCC) — 8 Missions
The NAPCC was launched in 2008 with eight national missions:
| Mission | Ministry | Focus |
|---|---|---|
| 1. National Solar Mission (NSM) | MoNRE | Scale up solar energy; target 500 GW by 2030 |
| 2. National Mission for Enhanced Energy Efficiency (NMEEE) | BEE/MoPNG | Reduce energy intensity; PAT scheme |
| 3. National Mission on Sustainable Habitat | MoHUA | Green buildings; urban transport; waste management |
| 4. National Water Mission (NWM) | MoJSW | 20% water use efficiency improvement; basin management |
| 5. National Mission for Sustaining the Himalayan Ecosystem (NMSHE) | MoES | Glacier monitoring; biodiversity; traditional knowledge |
| 6. National Mission for a Green India (GIM) | MoEFCC | Afforestation 10 million ha; enhance carbon sinks |
| 7. National Mission for Sustainable Agriculture (NMSA) | MoA | Climate-resilient crops; soil health; water efficiency |
| 8. National Mission on Strategic Knowledge for Climate Change (NMSKCC) | DST | Climate research; data networks; international cooperation |
UPSC Mnemonic: SESH-WAG-K (Solar, Energy efficiency, Sustainable habitat, Himalayan ecosystem, Water, Agriculture, Green India, Knowledge)
LiFE Mission — Lifestyle for Environment
LiFE (Lifestyle for Environment) was launched by PM Modi at COP26 (Glasgow, 2021):
- Focus: Behavioural change at individual level — mindful consumption as climate action
- Three Rs: Reduce, Reuse, Recycle
- Promoted as India's contribution to global climate action through demand-side changes
- P3 model: Pro-Planet People
International Climate Finance and Agreements
| Agreement/Forum | India's Position |
|---|---|
| Paris Agreement (2015) | Signatory; NDC targets; principle of CBDR (Common But Differentiated Responsibilities) |
| COP26 Glasgow (2021) | Announced net-zero by 2070; LiFE initiative; joined Coalition for Disaster Resilient Infrastructure (CDRI) |
| COP27 Sharm el-Sheikh (2022) | Loss and Damage fund agreed — India advocated for this |
| COP28 Dubai (2023) | Operationalisation of Loss and Damage fund; India pushed for phasing down (not out) fossil fuels |
| COP29 Baku (2024) | New Collective Quantified Goal (NCQG) on climate finance; India demanded $1.3 trillion/year from developed nations |
| G20 Presidency 2023 | India hosted G20; climate finance and just energy transition were key themes |
Regional Impacts on India's Physical Geography
Himalayas
- Permafrost thaw: Destabilising slopes → increasing landslides in Uttarakhand, HP, Sikkim
- Joshimath subsidence (2023): Ground sinking in Joshimath (Chamoli district, Uttarakhand) due to groundwater depletion + construction + permafrost thaw — hundreds of buildings cracked; remains vulnerable
- GLOF risk: 5,000+ glacial lakes in India; ~200 identified as potentially dangerous
Coastal and Island Changes
- Lakshadweep: Sea level rise + bleaching threatens entire coral atoll system; some islands projected to be uninhabitable by 2050
- Andaman & Nicobar: Mangrove loss + coral bleaching; increased cyclone frequency
- Odisha coast: Most cyclone-prone; Bhubaneswar–Puri belt repeatedly struck (Fani 2019, Yaas 2021, Dana 2024)
Agricultural Zone Shifts
- Wheat belt shifting north: Punjab–Haryana wheat belt under heat stress; Himachal Pradesh, Uttarakhand hills becoming viable for winter wheat
- Tea gardens: Darjeeling and Assam tea facing temperature and rainfall stress; quality and quantity declining
- Apple belt: Shifting from Himachal Pradesh lowlands to higher altitudes → encroachment on alpine zones
Key Facts for UPSC
- India's warming: ~0.89°C (2015–2024 vs 1901–1930); Himalayas warming at ~0.28°C/decade
- Glacier loss: Accelerating — −0.28 m w.e./year (2010–2019); 30–50% volume loss projected by 2100
- Chamoli disaster (Feb 2021): GLOF/ice avalanche; 200+ deaths; Uttarakhand
- Sea level rise: 3.3 mm/year in north Indian Ocean; extreme events 2–3× more frequent
- Lohachara Island: First inhabited island submerged by sea level rise (Sundarbans, WB)
- Monsoon: Intensification of extremes; central India wetter; IGP and NE drying trend
- India's NDC (2022): 45% emissions intensity reduction by 2030; 50% power from non-fossil by 2030; Net-Zero by 2070
- NAPCC: 8 missions (2008); Solar, Energy efficiency, Sustainable habitat, Himalayan ecosystem, Water, Agriculture, Green India, Knowledge
- LiFE: Lifestyle for Environment; COP26 (2021); Pro-Planet People; Reduce-Reuse-Recycle
- COP28 (2023): Phase "down" (not out) fossil fuels — India's position
- COP29 (2024, Baku): India demanded $1.3 trillion/year climate finance
- Joshimath (2023): Land subsidence in Uttarakhand; climate + human pressures
- Arabian Sea cyclone intensity: +40% increase (1982–2019)
- Net-Zero 2070: India's long-term target; later than most developed nations (justified by CBDR)
UPSC Previously Asked
UPSC Current Affairs: Indian Ocean warming and Indian Ocean Dipole (IOD) are increasingly influencing monsoon outcomes. 2024 saw above-normal rainfall overall but severe spatial maldistribution.
UPSC Fact: India's net-zero target of 2070 is later than USA (2050), EU (2050), and China (2060) — India justifies this citing its development needs and historically low cumulative emissions (per-capita emissions ~1/7th of USA).
UPSC Mnemonic: SESH-WAG-K (Solar, Energy efficiency, Sustainable habitat, Himalayan ecosystem, Water, Agriculture, Green India, Knowledge)
India's average temperature has risen by ~0.89°C during 2015–2024 relative to the 1901–1930 baseline (PLOS Climate, 2024). The Hindu Kush Himalaya (HKH) region is warming faster — at ~0.28°C per decade (1950–2020) — compared to the global average.
2024 was India's hottest year since records began in 1901, with annual average land surface temperature +0.65°C above the 1991–2020 baseline — surpassing the previous record of +0.54°C set in 2016. The year 2024 also broke global heat records.
India's ~9,575 Himalayan glaciers are retreating at an accelerating rate: glacier mass loss increased from −0.17 m water equivalent/year (2000–2009) to −0.28 m w.e./year (2010–2019). Projected volume loss by 2100 is 30–50% under 1.5–2°C warming, rising to 70–80% under 4°C warming.
The Chamoli disaster (February 7, 2021, Uttarakhand) was triggered by a glacial lake outburst or ice/rock avalanche and killed 200+ people, destroying two hydropower projects on the Rishiganga and Dhauliganga rivers. It highlighted the growing GLOF risk under climate change.
Sea level in the north Indian Ocean is rising at 3.3 mm/year (1993–2017). Extreme sea-level events have become 2–3 times more frequent. Under business-as-usual scenarios, 100-year extreme sea-level events on the Arabian Sea coast could become annual by mid-century.
Lohachara Island in the Sundarbans (West Bengal) was the world's first inhabited island to be fully submerged by rising sea levels. Ghoramara Island has lost ~50% of its land area since 1969 and is projected to be largely submerged by 2040 on current trajectories.
Climate change is causing a spatial shift in monsoon rainfall: a declining trend in the Indo-Gangetic Plain and northeastern India, and an increasing trend in central India (Madhya Pradesh, Chhattisgarh). Overall, extreme rainfall events are increasing while the number of rainy days is decreasing ('wet spells wetter, dry spells drier').
Joshimath (Chamoli district, Uttarakhand) experienced severe land subsidence in January 2023, with hundreds of buildings developing cracks. The subsidence is attributed to a combination of groundwater depletion, heavy construction, and permafrost thaw driven by Himalayan warming.
India submitted its updated Nationally Determined Contribution (NDC) to the UNFCCC in August 2022 with three 2030 targets: reduce emissions intensity of GDP by 45% (from 2005 levels), achieve 50% electric power from non-fossil fuels, and create an additional carbon sink of 2.5–3 billion tonnes of CO₂ equivalent.
India's long-term net-zero emissions target is 2070 — later than the USA (2050), EU (2050), and China (2060). India justifies this under the principle of Common But Differentiated Responsibilities (CBDR), citing its development needs and per-capita emissions that are ~1/7th of the USA.
The National Action Plan on Climate Change (NAPCC) was launched in 2008 with eight missions: National Solar Mission, National Mission for Enhanced Energy Efficiency, National Mission on Sustainable Habitat, National Water Mission, National Mission for Sustaining the Himalayan Ecosystem, National Mission for a Green India, National Mission for Sustainable Agriculture, and National Mission on Strategic Knowledge for Climate Change.
LiFE (Lifestyle for Environment) was launched by PM Modi at COP26 (Glasgow, November 2021). It focuses on behavioural change through mindful consumption — guided by the 'P3' (Pro-Planet People) model — and promotes Reduce, Reuse, Recycle as climate action from the demand side.
At COP28 (Dubai, 2023), India's key position was to phase 'down' (not 'out') fossil fuels — a distinction that preserves India's right to continue using coal for energy security during its development phase. The meeting also operationalised the Loss and Damage fund first agreed at COP27.
At COP29 (Baku, Azerbaijan, 2024), India demanded $1.3 trillion per year in climate finance from developed nations under the New Collective Quantified Goal (NCQG) framework, arguing that the $100 billion/year commitment from 2009 was grossly insufficient for developing countries to adapt.
India held the G20 Presidency in 2023 and made climate finance and just energy transition key agenda items. The Coalition for Disaster Resilient Infrastructure (CDRI) — India's initiative launched at COP26 — has grown to 40+ member countries by 2024.
Agricultural zone shifts are occurring under climate change: wheat production is moving northward as Punjab–Haryana face heat stress; Darjeeling and Assam tea quality is declining; apple orchards in Himachal Pradesh are shifting to higher altitudes, encroaching on alpine zones.
Arabian Sea cyclone maximum pre-monsoon intensity increased by 40% between 1982 and 2019, and 100-year extreme sea-level events on the Arabian Sea coast are projected to become annual events by mid-century under high-emission scenarios — primarily driven by Indian Ocean warming.
Under the high-emission scenario (SSP5-8.5), India's temperature could rise 3.0–4.5°C above 1995–2014 levels by end of century (2081–2100). Under an intermediate scenario (SSP2-4.5), India faces 1.5–2.5°C end-century warming, with a 6–8% increase in mean SW monsoon rainfall but greater spatial variability.
Related Chapters
Glaciers and the Cryosphere of India
Himalayan glaciers and the Third Pole — glacier inventory, Siachen/Gangotri/Zemu, retreat causes, Karakoram Anomaly, GLOF risk (Sikkim 2023), permafrost, NMSHE, and ICIMOD.
Cyclones, Tropical Weather Systems & Disaster Risk Reduction
Wetlands, Mangroves & Ramsar Sites of India
Indian Ocean — Oceanography and Maritime Significance