steelTalks is a monthly series on topics of interest to the global steel community. The lectures are presented in a webinar format with a guest lecturer. This presentation proposes to discuss elementary concepts about CO2 emissions, such as the Carbon Footprint and Embedded Carbon, as well as how to review the stages of a Building Life Cycle and its relationships with the scopes defined by the GHG Protocol Corporate Accounting and Reporting Standard (Scopes 1,2 and 3).