When we again weigh each sensitivity by the percent-area for the Earth, our global average ECS is 7.2 °C per doubling of CO2, much higher than the most recent IPCC estimates of 2.3 to 4.5 °C and consistent with some of the latest state-of-the-art models which suggest ca. 5.2 °C
2.3c means crop failures and food shortages globally. 5.2c means the end of our civilisation. 7.2c means the end of our species.
The house building companies already have vast amounts of land they own with planning permission in place. They restrict the amount of housing they build to artificially keep the prices high, if they build too many, the prices they could sell their houses for would drop, reducing profit. These are private companies and the government has little control over them. This is why every government for the last few generations has promised more houses and delivered nothing.