In summary, in most basins fed by glaciers, runoff is projected to increase initially in the 21st century and then decline . Projections suggest a further decrease in seasonal snow cover extent and mass in mid to high latitudes and high mountains , though the projection spread is considerable. Permafrost will continue to thaw throughout the 21st century . There is medium confidence that future changes in cryospheric components will negatively affect irrigated agriculture and hydropower production in regions dependent on snowmelt runoff.
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report