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The document explains the methodology of the Green Footstep tool, which calculates the net carbon flow of building projects by analyzing site development, construction, and operation. It defines carbon neutrality as achieving a net carbon storage level equal to or greater than the site's native state. The paper provides specific formulas for calculating native site carbon storage, emissions from site development, and operational emissions. For construction emissions, it details an Economic Input-Output Life Cycle Assessment (EIO LCA) approach based on 1997 US economic data, offering coefficients for residential, multifamily, manufacturing/industrial, and commercial/institutional sectors. It also includes a historical validation comparing 1997 energy intensity coefficients with 1967 data, noting a general decrease in energy intensity for most sectors except commercial and institutional buildings.