Bhutan and the Third Pole Initiative

The Third Pole is the working name used in climate science and policy for the Hindu Kush–Himalayan glacial region — the high-elevation cryosphere stretching from Afghanistan to Myanmar that holds the largest reserves of frozen freshwater outside the polar ice sheets. The framing was popularised by the International Centre for Integrated Mountain Development (ICIMOD), the Kathmandu-based intergovernmental body of which Bhutan is a founding member, and is now standard usage in IPCC, UNDP and UNFCCC documents.^[1]

Bhutan is a small but consistent participant in Third Pole science and diplomacy. The country contributes a glacier inventory of 677 glaciers and 2,674 glacial lakes, 24 of them classified as potentially dangerous, and has been the site of two major glacial-lake outburst flood (GLOF) events in living memory.^[2] In international climate forums Bhutan deploys its constitutional 60 per cent forest cover requirement and its carbon-negative net emissions profile to push for stronger ambition from larger emitters, particularly the LDC negotiating group it belonged to before graduation in December 2023.^[3]

The country's Third Pole engagement runs through three principal channels: bilateral and multilateral cryosphere science with ICIMOD, GLOF risk reduction projects funded by UNDP and the Green Climate Fund, and political advocacy at successive UNFCCC Conferences of Parties.

The Third Pole framing

ICIMOD has used "Third Pole" since the early 2000s to describe the contiguous mountain cryosphere of the Hindu Kush, Karakoram and Himalaya, with secondary use covering the Tibetan Plateau as a whole. The 2019 Hindu Kush Himalaya Assessment, ICIMOD's flagship synthesis, projected that one-third of Hindu Kush–Himalayan glaciers would be lost by 2100 even under a 1.5 °C warming pathway, and two-thirds under business-as-usual.^[1] The Third Pole is the source of ten of Asia's major rivers — including the Brahmaputra system into which Bhutan's rivers drain — and its meltwater regime affects roughly 1.65 billion downstream people.

For Bhutan, this framing aligns with a domestic perception that the country is climate-vulnerable but not climate-responsible: total annual emissions are well below the country's forest sequestration capacity, but its glaciated north is warming faster than global averages.

Glacier inventory and GLOF risk

Bhutan's National Centre for Hydrology and Meteorology (NCHM) and ICIMOD jointly maintain the country's glacier and glacial-lake inventory. The most recent reassessment lists 677 glaciers and 2,674 glacial lakes, of which 24 are flagged as potentially dangerous on the basis of size, dam stability, upstream hazard and downstream exposure.^[2] Two events anchor the country's GLOF history:

• Lugge Tsho, 7 October 1994. A partial breach of Lugge Tsho in the upper Pho Chhu basin released roughly 18 million cubic metres of water. The flood travelled approximately 80 kilometres in seven hours, killed an estimated 21 people, damaged Punakha Dzong and destroyed about 90 houses. It remains the most destructive natural disaster in Bhutan's modern history.^[4]
• Thorthormi mitigation, 2008–2011. A UNDP–GEF project undertaken jointly with the Royal Government lowered the Thorthormi supraglacial lake by approximately five metres, draining around 17 million cubic metres of water by manual excavation in successive monsoon seasons. The project is regularly cited as a model of community-led GLOF risk reduction in high-altitude, low-capacity contexts.^[5]
• Lemthang Tsho, 28 July 2015. A smaller GLOF on a tributary of the Mo Chhu released 0.37 million cubic metres of water. There were no human deaths, but four horses were killed and trekking infrastructure was lost.^[6]

A 2026 hydrodynamic flood-mapping study published in Natural Hazards and Earth System Sciences estimates that more than 11,000 people, 2,500 buildings, 250 kilometres of road, 400 bridges and 20 square kilometres of farmland are exposed to potential GLOF impacts in Bhutan.^[7] The risk profile is concentrated in Lunana, Gasa, the Punakha–Wangdue corridor and the upper Bumthang valleys.

Carbon-negative diplomacy

Bhutan's position in international climate negotiations rests on three claims: that it absorbs more carbon than it emits, that this carbon-negative status is constitutionally entrenched through the 60 per cent minimum forest cover provision in Article 5 of the Constitution, and that it is therefore a donor of climate services rather than a recipient. The country's Third Nationally Determined Contribution, submitted in November 2025, projects gross emissions of 4,454 Gg CO2-equivalent (excluding land-use sinks) against a forest sequestration capacity of 10,965 Gg, sustaining net-negative emissions through 2035.^[3]

Before its graduation from least-developed country status on 13 December 2023, Bhutan was an active member of the LDC negotiating group at the UNFCCC and a front-runner under the LDC Initiative for Effective Adaptation and Resilience (LIFE-AR). The country also contributed to the Bhutan Climate Summit, an ICIMOD-supported forum convened periodically in Thimphu to coordinate Hindu Kush–Himalayan climate policy.^[8]

The 13th Five Year Plan

The 13th Five Year Plan (2024–2029), adopted in 2024, treats climate change as a cross-cutting development challenge. Its Ecological Diversity and Resilience Programme aims to maintain net-zero or net-negative emissions, decouple GDP growth from greenhouse gas output, and expand adaptation programming in agriculture, hydropower and disaster risk reduction. The plan is the operational counterpart to the Third NDC and routes most Third Pole-relevant work — glacier monitoring, GLOF early warning, watershed management — through the Ministry of Energy and Natural Resources and the National Environment Commission Secretariat.^[3]

Partnerships

The principal external partners on Bhutan's Third Pole work are ICIMOD (cryosphere science, regional coordination), UNDP (GLOF mitigation, adaptation finance, NDC support), the Green Climate Fund (project finance), the Asian Development Bank (transport and energy adaptation co-financing), and the World Bank (institutional assessment and country systems support).^[9] Bhutan also participates in the Cryosphere Initiative coordinated jointly by ICIMOD and the Climate and Cryosphere Project, and contributes to regional glacier monitoring through its NCHM hydromet network.

References

1. Bhutan Summit — ICIMOD
2. Reassessment of Potentially Dangerous Glacial Lakes in Bhutan — NCHM
3. Kingdom of Bhutan — Third Nationally Determined Contribution (Provisional, November 2025) — UNFCCC
4. The 1994 Lugge Tsho Glacial Lake Outburst Flood, Bhutan Himalaya — ICIMOD
5. ICIMOD — UNDP Climate Change Adaptation
6. Cause and Impact: The 2015 Lemthang Tsho GLOF in Bhutan — ICIMOD
7. Advancing glacial lake hazard and risk assessment in Bhutan through hydrodynamic flood mapping and exposure analysis — NHESS
8. Bhutan reaffirms carbon neutrality in its most ambitious climate plan yet — UNDP
9. Bhutan Climate Change Institutional Assessment — World Bank