Even at zero population growth, old buildings wear out and need to be replaced. Especially when we build them like most postwar US construction. Likewise, espec

Even at zero population growth, old buildings wear out and need to be replaced. Especially when we build them like most postwar US construction. Likewise, especially in harsher climates, replacing worn-out older buildings with passivhaus-grade buildings will reduce energy consumption in the long run, and it's impractical to upgrade many older buildings to such a level of insulation.