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The Hindu Kush-Himalayan-Tibetan (HKHT) region is warming twice as fast as the global average, with temperatures increasing by 1.2 °C over the last 120 years. This warming, driven by CO2 and black carbon (BC), is causing widespread glacier retreat and a weakening of the South Asian monsoon system. Black carbon, a byproduct of incomplete combustion from fossil fuels and biomass, reduces snow albedo and heats the lower atmosphere via Atmospheric Brown Clouds (ABCs), potentially playing a role as significant as CO2 in melting Himalayan glaciers. These changes threaten water security for millions, including 500 million people in the Ganges River Basin, and increase the frequency of glacial lake outburst floods (GLOFs).