Climate change · Nepal

Climate Change Impacts on Nepal

Nepal is responsible for less than 0.025% of global greenhouse gas emissions, yet it is among the world's most climate-vulnerable countries. Extreme topography, dependence on glacier meltwater, monsoon-fed agriculture, and high poverty rates combine to make every degree of warming disproportionately damaging.

Temperature rise since 1975

+1.8°C

Nearly 2× global average warming rate

Glacier area lost (1977–2010)

24%

3,808 glaciers retreating 38 m/year

Dangerous glacial lakes

Out of ~2,070 glacial lakes identified

Deaths/year (floods & landslides)

1–2k

68 of 77 districts are landslide-prone

Impact overview

Six dimensions of climate impact

From retreating glaciers to failing harvests, Nepal's climate crisis is already measurable across every sector of society and environment.

TemperatureCriticalतापमानको तीव्र वृद्धि

Accelerating Temperature Rise

+1.8°C since 1975 - warming nearly twice the global average

Nepal's annual mean temperature has risen approximately 1.8°C since the 1970s, compared to the global average of ~1.1°C. The Hindu Kush Himalaya region is warming at approximately 0.5°C per decade - among the fastest warming zones on Earth. High-altitude areas above 3,500 m are experiencing even more rapid warming.

Observed temperature increase (1975–2023): ~1.8°C
Rate of warming (Himalaya vs global): ~1.6× faster
Projected rise by 2050 (RCP4.5 scenario): +1.5°C to +2.5°C
Projected rise by 2100 (RCP8.5 scenario): +4.0°C to +6.0°C
Days >35°C in Terai (increase since 1980): +10–15 days/year

All regionsMountain ecosystems most severely affectedTerai experiencing extreme heat events

GlaciersCriticalहिमनदीको तीव्र पग्लाउ

Rapid Glacier Retreat

24% glacier area loss 1977–2010; 47 dangerous glacial lakes identified

Nepal's approximately 3,808 glaciers cover 4.8% of the country's total land area and are retreating at an average of 38 m/year. ICIMOD's glacier monitoring shows a 24% reduction in glacier area between 1977 and 2010. This creates two converging risks: short-term flooding from glacial lake outburst floods (GLOFs) and long-term reduction of dry-season river flows.

Number of glaciers in Nepal: 3,808
Glacier area (2020 estimate): ~3,900 sq km
Glacier area loss (1977–2010): ~24%
Average retreat rate: 38 m/year
Glacial lakes identified: ~2,070
Potentially dangerous glacial lakes: 47

Solukhumbu (Imja Lake)Manang (Thulagi Lake)Dolakha (Tsho Rolpa)Taplejung (Sabai Tsho)All mountain river basins

WaterHighजलस्रोतमा परिवर्तन

Shifting Water Resources

Rivers may gain flow short-term then decline; groundwater depleting in Terai

As glaciers melt, Nepal's rivers are experiencing temporarily increased flows - particularly during the dry season - followed by an eventual reduction as glacier mass is exhausted. Meanwhile, Terai groundwater (the source of irrigation for 70% of Nepal's food production) is declining due to over-extraction and reduced recharge from erratic monsoons.

Koshi River flow increase (last 30 years): +12–15%
Groundwater level decline in Terai: 0.5–1.2 m/decade
Monsoon variability increase: High - delayed onset, intense bursts
Projected river flow decline by 2050 (glacial melt exhausted): 20–30% dry-season reduction

Terai irrigation-dependent agricultureKoshi, Gandaki, Karnali river basinsMountain hydropower plants

Extreme WeatherCriticalचरम मौसम घटना बढ्दो

Increasing Extreme Weather Events

Floods, landslides and droughts increasing in frequency and severity

Nepal is experiencing more frequent and intense extreme weather events linked to climate change. Landslides cause 1,000–2,000 deaths annually - among the highest per-capita rates in the world. The monsoon is becoming more erratic, with longer dry spells interrupted by intense rainfall episodes that trigger flash floods and landslides.

Annual deaths from floods and landslides: 1,000–2,000
Landslide-prone districts: 68 of 77
Economic losses from floods and landslides (2022): NPR ~40 billion
GLOF events recorded since 1985: 14 major events
Forest fire incidents (2020–23 avg): 4,000+ hotspots/year

Hills and mountains (landslides)Terai flood plainsChuria/Siwalik hills (deforestation risk)Urban areas (heat waves)

BiodiversityHighजैविक विविधतामा खतरा

Biodiversity and Ecosystem Stress

Alpine zones shifting upward; snow leopard and rhododendron habitats shrinking

Nepal's extraordinary biodiversity - including 2% of the world's flowering plants and 8% of world bird species in just 0.1% of Earth's surface - is under increasing pressure from rising temperatures that push habitat zones upward, with nowhere to go at the mountain peaks. ICIMOD's alpine biodiversity monitoring shows measurable upward shifts in plant communities.

Upward shift in alpine plant zone: ~29 m elevation/decade
Snow leopard range in Nepal: ~60,000 sq km (at risk)
Nepal's flowering plant species: 6,391 (2% of world total)
Bird species in Nepal: 886 (8% of world total)
Mammal species in Nepal: 208
Red-listed species in Nepal: 160+

Alpine meadows (3,500–5,000 m)Terai grasslands (Bengal tiger habitat)Trans-Himalayan cold desert (snow leopard)Wetlands (bird habitat)

AgricultureHighकृषि र खाद्य सुरक्षामा असर

Agriculture and Food Security Disruption

Shifting monsoon threatens rice production; mountain subsistence farming under stress

Climate change is disrupting Nepal's agricultural systems, which support ~60% of the population's livelihoods. Erratic monsoon onset has caused 15–20% yield losses in rain-fed rice crops in some years. In mountain areas, the growing season is actually lengthening slightly (allowing new crops at altitude), but water availability and temperature extremes are creating net negative impacts.

Estimated yield loss from erratic monsoon (rice): 15–20% in drought years
Households with food insecurity (mountain areas): 40–60%
Districts facing water stress for irrigation: 22 (out of 77)
Pest/disease outbreaks (fall armyworm, new pests): Increasing since 2018

Mountain subsistence farming areasRain-fed rice and maize zones (mid-hills)Karnali Province food-deficit areasFar-western Nepal

Deep dive - Temperature

Nepal's accelerating temperature rise

The Himalaya is warming faster than any other mountain system on Earth. Nepal's own records confirm +1.8°C since the mid-1970s - a rate nearly 1.6 times the global average, with projected increases that could reshape the monsoon system and render large areas of farmland marginal.

Temperature scenarios

Historical observation vs projected ranges under IPCC emission pathways

Observed rise 1975–2023 (Nepal)+1.8°C

Source: Department of Hydrology and Meteorology, Nepal

Global average warming (same period)+1.1°C

Source: WMO / IPCC AR6

Projected rise by 2050 - RCP4.5 scenario+1.5–2.5°C

Source: Nepal Third National Communication to UNFCCC 2022

Projected rise by 2100 - RCP8.5 worst case+4.0–6.0°C

Source: ICIMOD Hindu Kush Himalayan Assessment 2019

Impact on monsoon

Warming disrupts the temperature differential between the Indian Ocean and the Himalayan highlands that drives the South Asian monsoon. Nepal is already experiencing longer dry spells punctuated by more intense rainfall events - increasing both drought risk in the pre-monsoon period and flash-flood risk during the monsoon.

Impact on agriculture

The Terai - Nepal's breadbasket - is seeing 10–15 additional days above 35°C per year compared to 1980. Heat stress during rice and wheat pollination directly reduces grain yields. At the same time, erratic monsoon onset disrupts planting calendars that have remained unchanged for generations.

Impact on human settlements

Under the RCP8.5 worst-case scenario, parts of the Terai could become lethally hot during summer months by 2100, forcing migration. Himalayan villages face increased GLOF and landslide exposure as permafrost degrades and glacial lakes expand. An estimated 2–3 million Nepalis live within GLOF-risk river corridors.

Deep dive - Glaciers

The glacier crisis

Nepal's glaciers are both a water tower for 800 million people and an increasing source of catastrophic flood risk. Rapid retreat is draining the ice reserves that sustain dry-season river flows, while growing meltwater lakes threaten sudden, devastating outburst floods.

Glaciers in Nepal

3,808

Covering ~3,900 sq km (ICIMOD 2021)

Area lost 1977–2010

24%

Confirmed by ICIMOD satellite monitoring

Average retreat rate

38 m/yr

Accelerating in recent decades

Major GLOF events since 1985

Including Dig Tsho 1985 and Sabai Tsho 1998

Glacier area metrics

Scale of loss and current risk

Glacier area loss 1977–201024%

ICIMOD Remote Sensing Study 2014

Share of Nepal's land area (glaciers)4.8%

ICIMOD SNHDB 2021

Dangerous glacial lakes (% of all identified)47 of ~2,070

ICIMOD & UNDP 2023

47 potentially dangerous glacial lakes

ICIMOD and UNDP have identified 47 glacial lakes in Nepal that are potentially dangerous - meaning the moraine or ice dam retaining them could fail under warming temperatures, seismic activity or mass movement. A single GLOF from the largest lakes (Imja, Thulagi, Tsho Rolpa) could release hundreds of millions of cubic metres of water within hours.

Imja Lake

Solukhumbu · 5,010 m

~75 million m³

Tsho Rolpa

Dolakha · 4,580 m

~85 million m³

Thulagi Lake

Manang · 4,020 m

~35 million m³

Sabai Tsho

Taplejung · 4,440 m

~12 million m³

All four have automated early warning systems installed by ICIMOD/UNDP, giving downstream communities 30–60 minutes of warning. Source: ICIMOD GLOF Studies 2023.

Deep dive - Biodiversity

Biodiversity and ecological stress

Nepal hosts 2% of the world's flowering plants and 8% of bird species in just 0.1% of Earth's land area. Climate-driven habitat shifts, glacier loss and forest fires are compressing these ecosystems - with alpine zones moving upward 29 m per decade and no higher ground available for summit-zone species.

Alpine zone shift

29 m/decade

Upward elevation migration of plant communities (ICIMOD 2022)

Snow leopard range at risk

~60,000 km²

Entire trans-Himalayan and high alpine habitat zone (WWF 2022)

Red-listed species

160+

Nepal species on the IUCN Red List (2023)

Threats by ecological zone

Each of Nepal's five ecological zones faces a distinct but overlapping set of climate pressures.

Terai and Inner Terai

तराई र भित्री मधेस

60–300 m

Sub-tropical to tropical monsoon; 1,500–2,500 mm annual rainfall

Climate threats

Habitat conversion to farmland
Poaching
Invasive species (Mikania)
Flood-induced deforestation

Key species

Bengal tigerGreater one-horned rhinocerosAsian elephantGharial crocodileGangetic dolphinBengal florican

Siwalik / Churia Hills

सिवालिक / चुरे

300–1,500 m

Sub-tropical, monsoonal; 1,200–2,000 mm rain

Climate threats

Deforestation for agriculture
Quarrying and sand extraction
Encroachment
Forest fire

Key species

LeopardSloth bearBarking deerWild boarCrested serpent eagle

Middle Hills and Valleys

मध्यपहाड र उपत्यका

1,500–3,000 m

Temperate, moderate monsoon; 1,200–2,400 mm rain

Climate threats

Agricultural expansion
Fuel-wood collection
Landslides from road construction
Climate-driven drought

Key species

Himalayan black bearCommon leopardRed pandaSatyr tragopanHimalayan monal (danphe)

High Himal and Alpine

उच्च हिमाल र अल्पाइन

3,000–5,000 m

Sub-alpine to alpine; cold, less than 800 mm precipitation

Climate threats

Climate warming (upward shift of all zones)
Glacier retreat
GLOF risk
Overgrazing by yaks

Key species

Snow leopardHimalayan tahrBlue sheepPikaHimalayan snowcock

Trans-Himalayan / Rain Shadow

ट्रान्स-हिमालय / वर्षाछायाँ

3,000–5,000 m (Mustang, Dolpo, Manang)

Cold arid steppe; less than 300 mm annual precipitation

Climate threats

Overgrazing
Desertification
Tourism pressure
Rare herb over-collection

Key species

Snow leopardTibetan wolfKiang (wild ass)Tibetan gazelleHimalayan griffon vulture

Forest fire trend

Forest fires are increasing in frequency and severity across Nepal's mid-hills and Churia range, driven by longer dry seasons and rising temperatures. The Department of Forest and Soil Conservation (DFRS) recorded over 4,000 fire hotspots per year on average between 2020 and 2023. Spring fires in 2021 burned over 50,000 ha across Nepal - causing significant biodiversity loss and air-quality emergencies in Kathmandu.

Deep dive - Extreme weather

Floods, landslides and extreme weather

Nepal's steep topography and heavy monsoon rainfall have always made it landslide-prone. Climate change is amplifying the intensity and unpredictability of rainfall events, turning manageable seasonal floods into life-threatening disasters.

Disaster statistics

Annual scale of extreme weather impacts

Landslide-prone districts68 / 77

NDRRMA Nepal 2023

Annual deaths - floods & landslides (midpoint)1,000–2,000/yr

MoHA Nepal Disaster Report 2022

Forest fire hotspots (annual average 2020–23)4,000+/yr

DFRS Nepal 2023

Annual death toll: 1,000–2,000

Nepal's Ministry of Home Affairs records between 1,000 and 2,000 deaths from floods and landslides every year - one of the highest per-capita disaster death rates in Asia. The 2021 monsoon season alone killed over 1,200 people. These figures do not include non-lethal injuries, displacement or livestock loss, which multiply economic damage severalfold.

NPR 40 billion economic loss (2022)

The Ministry of Home Affairs estimated flood and landslide damages in 2022 at approximately NPR 40 billion (≈USD 300 million) - roughly 1% of GDP. Losses include destroyed infrastructure, agricultural land, homes and productive assets. Mountain communities, often uninsured, bear these losses without compensation.

14 major GLOF events since 1985

Major recorded GLOF events include the 1985 Dig Tsho flood (Solukhumbu), which killed 5 people, destroyed a nearly-complete hydropower plant and swept away bridges and trails over 90 km. The 1998 Sabai Tsho flood (Taplejung) affected communities 100 km downstream. ICIMOD projects GLOF frequency will increase as glacial lakes expand.

Deep dive - Agriculture

Food security and agricultural disruption

Agriculture employs approximately 60% of Nepal's workforce. Erratic monsoons, temperature extremes and pest expansions are converging to undermine decades of food security progress - especially in remote mountain districts already facing chronic deficits.

Rice yield loss (drought years)

15–20%

Rain-fed rice under erratic monsoon. Source: NARC Nepal 2022

Food insecure households (mountains)

40–60%

Mountain district estimates. Source: WFP Nepal CFSAM 2022

Districts under water stress

22 / 77

Irrigation water stress identified. Source: MOALD Nepal 2023

Pest range expansion

Since 2018

Fall armyworm arrival; new pests expanding with warmer winters

Shifting monsoon onset

The monsoon is arriving later and ending earlier in some years, compressing the rice-growing window. Paddy farmers who cannot change transplanting dates face grain filling during heat stress or cut the season short before maturity. NARC studies show 15–20% rice yield reductions in drought years across the rain-fed mid-hill areas.

Mountain food insecurity

In Karnali Province and far-western Nepal, 40–60% of households already face food insecurity for 3–6 months per year. Climate change is eroding the subsistence crops - buckwheat, millet, potato - that these communities depend on. The growing season at higher altitudes is shifting, but water scarcity and frost timing offsets any benefit.

Pest and disease expansion

Fall armyworm (Spodoptera frugiperda), an invasive maize pest from Africa, was first recorded in Nepal in 2018 and has now spread to all major maize-growing districts. Warmer winters that previously limited pest survival are allowing populations to persist year-round, increasing crop losses. Pesticide costs are rising, particularly for small and marginal farmers.

Questions

Nepal climate impacts, answered

How much has Nepal's temperature risen?+

Nepal's annual mean temperature has risen approximately 1.8°C since the 1970s - nearly twice the global average of ~1.1°C. The Hindu Kush Himalaya region warms at roughly 0.5°C per decade, and high-altitude areas above 3,500 m are warming even faster.

How many glaciers does Nepal have?+

Nepal has approximately 3,808 glaciers covering around 3,900 sq km, or about 4.8% of the country's land area. ICIMOD monitoring shows a 24% reduction in glacier area between 1977 and 2010, with an average retreat rate of 38 m/year.

What is a GLOF and how many dangerous glacial lakes does Nepal have?+

A Glacial Lake Outburst Flood (GLOF) occurs when a moraine or ice dam holding a glacial lake fails suddenly, releasing a catastrophic flood downstream. Nepal has ~2,070 glacial lakes, of which 47 have been identified as potentially dangerous. At least 14 major GLOF events have been recorded in Nepal since 1985.

How many people die from floods and landslides in Nepal each year?+

Nepal records between 1,000 and 2,000 deaths annually from floods and landslides - one of the highest per-capita rates globally. 68 of Nepal's 77 districts are classified as landslide-prone. Economic losses in 2022 alone reached approximately NPR 40 billion.

How is climate change affecting Nepal's agriculture?+

Erratic monsoon onset and intensity have caused 15–20% yield losses for rain-fed rice in drought years. In mountain districts, 40–60% of households face food insecurity. New pests such as fall armyworm, previously absent from Nepal, have expanded their range as temperatures rise.

Ecosystems →

Forests of Nepal

Community forestry and Nepal's forest cover recovery.

Hydrology →

Rivers of Nepal

The Koshi, Gandaki and Karnali systems fed by Himalayan glaciers.

Sources & data note

Climate data is drawn from peer-reviewed ICIMOD publications, Nepal's official communications to the UNFCCC, and government agency reports (DHM, MoFE, MoHA, NDRRMA). Temperature projections reflect IPCC RCP4.5 and RCP8.5 scenarios applied to the Hindu Kush Himalayan region. All figures are cited to primary sources; ranges reflect scenario uncertainty. The editorial framing is Amarnepal's own.