The Greenhouse Gas Protocol classifies corporate emissions into three scopes that have become the structural backbone of every credible CRE climate disclosure. Scope 1 captures direct emissions from sources the reporting entity owns or controls, which in real estate typically means on-site combustion in boilers, gas-fired hot water heaters, emergency generators, and any owned vehicle fleet.
Scope 2 covers indirect emissions from purchased electricity, steam, heating, or cooling consumed in owned buildings. Scope 3 is the broadest and most contentious category, capturing fifteen sub-categories of value-chain emissions that the reporting entity does not directly control but is responsible for influencing.
For CRE owners, the practical difficulty of climate reporting lives in Scope 3. Tenant energy use in net-leased buildings sits in Category 13 (downstream leased assets), embodied carbon in construction materials sits in Category 2 (capital goods), and the emissions associated with development partners, property managers, and supply-chain vendors land across Categories 1, 4, and 11.
Most CRE portfolios cannot measure Scope 3 from primary data and instead rely on spend-based or activity-based estimation methods, which carry significant uncertainty and are increasingly scrutinized by GRESB assessors and ISSB-aligned regulators.
Scope boundary decisions also determine whether a portfolio's net-zero claims are defensible. The Science Based Targets initiative's Buildings Guidance requires Scope 1 and 2 coverage at the asset level plus Scope 3 coverage for any category that exceeds 40% of total value-chain emissions, which for most CRE owners means tenant energy and embodied carbon must be in scope.
Frameworks including the GHG Protocol Corporate Standard, ISSB S2, and the EU's CSRD all converge on the same structural taxonomy, but they differ on materiality thresholds, assurance requirements, and the treatment of equity-share versus operational-control consolidation, which determines whether a joint venture's emissions are reported by the JV partners proportionally or by whichever party has operational control.