According to data from the United States Environmental Protection Agency, the production of cement, a key component in concrete, is responsible for around 5% of global carbon emissions.

 

 On average, the thickness of a concrete floor is 40cm, and the carbon emission associated with building  will balance out walls, sealings, and other elements.

 

Using this calculation based on the average CO2 emissions per ton of cement, which is around 900 kilograms of CO2. To estimate the carbon emissions of a 1m2 concrete floor with 40cm thickness, would require 1120 kilograms of cement, which would result in around 1000 kilograms of CO2 emissions.