USA alone, SLR of 0.9 m could potentially put 4.2 million people at risk of inundation by the end of this century . However, number of people exposed to SLR does not evenly translate to forcibly displaced populations . Ascertaining how many people will move forcibly or as an adaptive response to SLR is inherently challenging because of the complex and highly individual nature of migration decisions . Implications of climate change for risks to human mobility across borders are even harder to quantify and highly uncertain, due to unknown developments in legal and political conditions that govern international migration .
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report