Water, Climate, and Sustainability

Bhutan, a small landlocked country in the Eastern Himalayas, is renowned for its ecological richness, snow-capped mountains, and commitment to environmental sustainability. With approximately 70% of its land under forest cover and a constitutional requirement to maintain a minimum of 60% in perpetuity, Bhutan remains carbon-negative and rich in freshwater resources. Nevertheless, the country is increasingly vulnerable to the impacts of climate change. Rising temperatures, especially during winter months and at higher altitudes, are contributing to rapid glacial retreat across the country. While Bhutan hosts a wide variety of glaciers, comprehensive field-based assessments have been limited by difficult terrain, logistical constraints, and resource limitations. However, remote sensing studies have clearly shown significant reductions in glacier extent. Glaciers that once extended to lower elevations are now restricted to altitudes above 4,000 m. This retreat has led to the formation and expansion of numerous glacial lakes, including supra-glacial, pro-glacial, and moraine-dammed types. The risk of glacial lake outburst floods is particularly acute in Bhutan, with 24 glacial lakes currently considered potentially dangerous. Such events pose severe risks to downstream communities, infrastructure, and livelihoods. Despite Bhutan's proactive environmental stance, it remains on the frontline of climate-related threats. These risks have far-reaching implications for Bhutan's water-dependent economy, particularly hydropower generation, agriculture, and tourism. Ensuring long-term water and climate security requires urgent investment in scientific research, risk assessment, and the development of adaptive and resilient strategies that align with national priorities and sustainable development goals.