Many mountain regions have one or more cryosphere components , and the mountain cryosphere is among the natural systems most sensitive to climate change worldwide . The SROCC assessed a decline in all cryosphere components due to climate change over recent decades, i.e., for low-elevation snow cover , permafrost  and glaciers  . More recent studies using globally more complete data sets show a considerably higher glacier mass loss  for 2000-2019 as compared to a  range of 123 +24 Gt yr1 for 2006-2015 in SROCC, with a mass loss acceleration of 48 +16 Gt yr1 per decade over 2000-2019 . Assessment conclusions in SROCC found with high confidence that glacier shrinkage and snow cover changes over the past two decades have led to changes in the amount and timing of runoff in many mountain regions .
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report