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Climate change in Nepal

Emissions, impacts and responses of Nepal related to climate change

  • 10 min read
  • 4 chapters

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Through Nepal, Himalayas and Mosquito

The floods of 2018 spread across the foothills of the Himalayas and brought landslides. They have left tens of thousands of houses and vast areas of farmland and roads destroyed. Nepal experienced flash floods and landslides in August, 2018 across the southern border, amounting to US$600 million in damages. There are reports of land which was once used for growing vegetables, and has become barren. Yak herders struggle to find grazing patches for their animals. Scientists have found that rising temperatures could spread malaria and dengue to new areas of the Himalayas, where mosquitoes have started to appear in the highlands.

Impacts on the natural environment

Temperature and weather changes

A climate trend analysis of Nepal (1971-2014) shows that the annual maximum temperature trend is significantly positive (0.056oC/yr). All Nepal annual minimum temperature trend is also positive (0.002oC/yr) but it is insignificant.

The effects of greenhouse gases (GHGs) on both drought and flooding events have been found, including severe winter drought and excessive monsoon flooding. Climate change has been alarming in the context of global warming. In Nepal, 95% of greenhouse gas emissions are from agriculture and forestry sectors; of this, 77% was from the forestry sector only. The consequences of global warming have had the most impact in developing and mountainous countries like Nepal, which has high intensity rainfall during rainy season. It has resulted in heavy floods, landslides and soil erosion. It is also common to find drought in many parts of Nepal that comes from the impacts of climate change and it impacts sectors like forest, water resources, agriculture, human health and biodiversity.

Dengue fever expansion

Historically confined to the lowland Terai region and urban transit hubs, dengue fever has expanded rapidly across Nepal due to shifting climate patterns. Since the first documented case in 2004 and initial outbreaks in 2006, national surveillance has tracked a steep rise in case numbers, geographic spread, and elevation boundaries. A massive epidemic during 2022–2023 reached all 77 districts of the country, recording a peak of 54,784 cases and 88 deaths in 2022 alone, with the geographic burden shifting from Kathmandu in 2022 eastward to Koshi Province in 2023.

Rising temperatures and changing precipitation patterns have created widening thermal suitability and longer seasonal transmission windows in the mid-hills, including around major population and tourist centers like Kathmandu and Pokhara. The primary mosquito vectors, Aedes aegypti and Aedes albopictus, have been detected at altitudes up to 2,100 meters in central Nepal. While definitive laboratory confirmation of active local viral transmission in the high Himalayas remains limited, clinical cases and active vectors are increasingly reported beyond the monsoon season in high-altitude districts such as Humla and Solukhumbu, signaling that altitude is becoming a less reliable proxy for arboviral safety in the region.

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