It won’t be uninhabitable, just prohibitedly expensive to live there. New houses made out of concrete to survive increased storms and sealed to survive floods, better ac and climate controls, tunnels running between different buildings in a house to avoid exposure to extreme outside heats. Dehumidifiers built into homes as well as ductless ac systems linked to massive condesors.
People will always live, just there will have to be new tech or more tech reliant.
Sad that people are screwing nature over so hardcore.