Climate change risks to cities, settlements and key infrastructure will rise rapidly in the mid- and long-term with further global warming, especially in places already exposed to high temperatures, along coastlines, or with high vulnerabilities . Globally, population change in low-lying cities and settlements will lead to approximately a billion people projected to be at risk from coastal-specific climate hazards in the mid-term under all scenarios, including in Small Islands . The population potentially exposed to a 100-year coastal flood is projected to increase by about 20% if global mean sea level rises by 0.15 m relative to 2020 levels; this exposed population doubles at a 0.75 m rise in mean sea level and triples at 1.4 m without population change and additional adaptation . Sea level rise poses an existential threat for some Small Islands and some low-lying coasts . By 2100 the value of global assets within the future 1-in-100 year coastal floodplains is projected to be between US$7.9 and US$12.7 trillion  under RCP4.5, rising to between US$8.8 and US$14.2 trillion under RCP8.5 . Costs for maintenance and reconstruction of urban infrastructure, including building, transportation, and energy will increase with global warming level , the associated functional disruptions are projected to be substantial particularly for cities, settlements and infrastructure located on permafrost in cold regions and on coasts . 
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report