The aggregate figures of population that could potentially be affected by permanent inundation shown in Table 15.4 and Figure 15.3 mask important differences in relative exposure between individual SIDS. Further, population affected by permanent inundation does not take into account the change in the frequency of ESL events and associated water-level attenuation , nor does it account for adaptation measures that may alleviate impacts, future population growth or the extent to which populations could adaptively migrate . However, the analysis by Rasmussen et al.  shows that comparatively small changes in mean sea level can result in large increases in the frequencies of ESL events and, hence, the risk of coastal flooding of inhabited land, suggesting many areas
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report