From https://architecture2030.org/why-the-building-sector/
We must eliminate all CO2 emissions from the built environment by 2040 to meet 1.5° Climate targets.
The Built Environment
The built environment generates 40% of annual global CO2 emissions. Of those total emissions, building operations are responsible for 27% annually, while building and infrastructure materials and construction (typically referred to as embodied carbon) are responsible for an additional 13% annually.