The Indus Waters Treaty (IWT) of 1960 survived three wars and decades of political hostility between India and Pakistan. That record of durability, however, should not be mistaken for relevance to today’s environmental needs. The basin the Treaty governs is warming. Glaciers are retreating at rates unimaginable to its negotiators. Hydrological patterns are shifting. Yet political discourse surrounding the IWT remains focused almost exclusively on sovereignty, security, and legal disputes, while climate change, the most consequential long-term threat to the basin, is consistently treated as secondary.
Climate-Blind by Design
The Treaty’s limitations on climate are structural, not incidental. At the time of signing, comprehensive studies on glacier mass balance did not exist. The assumption embedded in negotiations was that the Himalayan glaciers feeding the Indus system were broadly stable, and future changes due to climate variability were not factored into the design. The result is a framework that was built to allocate fixed water shares between two countries, not to manage a river system undergoing environmental transformation. There are no provisions for periodic review, no adaptive mechanisms, and no formal process for incorporating scientific advances into governance. The Permanent Indus Commission, the Treaty’s primary cooperative body, is a data-exchange and dispute-management mechanism, never designed for the world the Indus Basin is now entering.
What the Climate Record Shows
The Intergovernmental Panel on Climate Change (IPCC) Sixth Assessment Report (2022) projects, with high confidence, that by the mid-21st century, the Indus, alongside the Amu Darya and Ganges, will face severe water scarcity challenges as climatic variability acts as a stress multiplier across the basin. Himalayan glaciers currently supply 60 to 70 per cent of the Indus River’s summer flow and are estimated to be losing eight billion tons of ice annually. The World Meteorological Organization’s (WMO) 2024 State of Global Water Resources confirmed that 2024 was the third consecutive year of record glacier mass loss globally. Projections indicate a water deficit of up to 50 per cent in both countries’ portions of the basin by 2030. For Pakistan, which depends on the Indus for approximately 96 per cent of its average annual renewable water resources, the implications are particularly acute. These are not distant projections. They are documented trends occurring within a governance framework that has no mechanism to respond to them.
How Geopolitics Displaces Climate
The pattern is consistent. After the Uri attack in 2016, Indian Prime Minister Narendra Modi asserted that “blood and water cannot flow together.” After the 2019 Pulwama attack, India proposed diverting the Indus River. In February 2024, Pakistani media and political figures accused India of “water terrorism” over infrastructure projects on the Ravi River. In each episode, climate governance was either absent or invoked instrumentally within existing political arguments. April 2025 marked the most consequential instance. Following the Pahalgam attack, India placed the Treaty in abeyance and suspended the exchange of hydrological data, including flood warnings, river flow measurements, and glacier melt records, and halted the Permanent Indus Commission’s inspections. Pakistan responded by declaring any diversion of its Treaty-allocated water as an act of war. What was suspended was not merely diplomatic cooperation but the data infrastructure both countries need to manage a basin undergoing accelerating climate change. As WMO Secretary-General Celeste Saulo has observed: “Without data, we risk flying blind.” In the Indus Basin, that is now the institutional reality.
A Structural Problem, Not an Isolated One
The IWT’s climate blindness is not anomalous in South Asia. None of the region’s existing water-sharing arrangements incorporate climate considerations, with the sole exception of a 2023 Bhutan-India flood forecasting scheme. Climate change, however, does not observe bilateral boundaries. Altered monsoon patterns, glacial retreat, and increasing glacial lake outburst floods (GLOFs) affect entire basins regardless of how their waters are divided on paper. The challenge is compounded by the fact that climate-related risks operate at a basin-wide scale, while water governance in South Asia remains predominantly organised through bilateral arrangements. India’s August 2024 modification notice acknowledged climate-related pressures among its rationales, a notable shift from earlier arguments centred on hydroelectric disputes. Whether this signals a genuine reconceptualisation of climate as a governance priority remains unclear. Although climate considerations have entered the discourse surrounding the IWT they have not yet begun to drive it.
Conclusion
The IWT’s survival across six decades is a genuine institutional achievement. The question now is whether that durability can be converted into adaptability. The Indus Basin is warming, its glaciers are retreating, and the 1960 framework was not designed for these conditions. The suspension of hydrological data exchange in 2025 has removed the empirical basis on which any climate-responsive governance would depend. As long as climate change is processed through the categories of geopolitical competition rather than shared environmental governance, the Treaty’s defining challenge will remain unaddressed, and the cost will be borne not by the States negotiating over it, but by the hundreds of millions who depend on the river for their livelihoods.


