Asian and global water demands for irrigation, despite geographic variation in terms of water availability, are very likely to surpass supply by 2050 . A regional quantitative assessment  of the impacts of 1.5°℃ versus 2°℃ global warming for a major global climate-change hotspot-the Indus, Ganges and Brahmaputra river basins  in South Asia-shows adverse impacts of climate change on agricultural production, hydropower production and human health. A global temperature increase of 1.5℃ with respect to pre-industrial levels would imply a ~2.1℃ temperature increase for IGB, whereas under a 2.0℃ global temperature increase scenario, these river basins would warm by ~ 2.7℃. Future warming is expected to further increase rain-on-snow events that can cause snowmelt flood during winter , affecting hydropower and resulting in river flooding, avalanches and landslides.
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report