Concrete alone is 4-8% of global annual emissions, so I would imagine once you factor the carbon impact of destroying, hauling away the rubble, and then making,

Concrete alone is 4-8% of global annual emissions, so I would imagine once you factor the carbon impact of destroying, hauling away the rubble, and then making, transporting new building materials, the net impact is not good. There is a reason why most cities are targeting retrofits. https://en.wikipedia.org/wiki/Environmental_impact_of_concrete https://en.wikipedia.org/wiki/Environmental_impact_of_concre...