To define the geographical scope of the assessment in this CCP and to quantify the human population residing within these regions, the mountain characterisation given by Kapos et al.  , minus Antarctica, Svalbard and Greenland , was employed. This characterisation is consistent with the mountain region extents used in the AR6 WGI report ) and yields a global mountainous area of 31.74 million km2, which corresponds to approximately 23.5% of the global land surface. In 2015, a total of 1.28 billion people resided in mountain regions as delineated for this CCP .
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report