Several countries in the region have already issued drought warnings, with upcoming harvests and access to water at risk for populations already facing longer, hotter, and more frequent heatwaves.

It urged countries that rely on the 12 major river basins in the region to develop "improved water management, stronger drought preparedness, better early warning systems, and greater regional cooperation."

"Carbon emissions have already locked in an irreversible course of recurrent snow anomalies in the HKH (Hindu Kush-Himalayas)," Gyamtsho said.