The Greenhouse Gas Protocol has consolidated the development of its principal corporate emissions standards into a single programme as it works towards a common global framework with the International Organization for Standardization.
The revised plan brings together work on the Corporate Standard, Scope 2 Guidance, Scope 3 Standard and Guidance, and Actions and Market Instruments. It also incorporates the partnership between GHG Protocol and ISO, which was established to harmonise corporate greenhouse gas accounting requirements that have previously developed through separate but overlapping systems.
A proposed consolidated corporate standard is expected to enter public consultation during the second quarter of 2027. Final publication is scheduled for the fourth quarter of 2028, subject to technical development, governance approval, consultation feedback, and coordination with ISO working groups.
The programme is intended to provide a clearer basis for calculating and reporting emissions at organisational level. GHG Protocol standards are already embedded in corporate inventories, target setting programmes, climate disclosures, procurement requirements, and supply chain reporting across thousands of organisations.
Tim Mohin, chief executive of GHG Protocol, said: “A consolidated corporate standard represents a significant step toward integrating and harmonising greenhouse gas accounting across the world.”
Scope 2 emissions, which cover purchased electricity, steam, heat, and cooling, remain among the most contested elements of corporate carbon accounting. Companies have frequently used renewable energy certificates and contractual products to report lower emissions than would be associated with the average electricity grid supplying their operations.
A public consultation on proposed Scope 2 changes ran between October 2025 and January 2026. Feedback from that process will be considered alongside input from ISO specialists before the independent standards board decides how the technical work should continue.
Scope 3 presents a different set of difficulties. It often represents the largest share of a company’s reported footprint but depends heavily on information provided by customers, suppliers, logistics operators, employees, and investee businesses.
Much of that data remains incomplete, based on sector averages, or calculated through methodologies that are difficult to compare between organisations. Consolidation will not remove those limitations, although it could reduce the number of competing interpretations that companies have to reconcile.
Greater consistency would allow sustainability teams, finance departments, auditors, lenders, customers, and regulators to work from a more coherent accounting base. It could also reduce duplication for multinational groups reporting across several voluntary and regulatory frameworks.
The revision is taking place while climate reporting faces competing political and commercial pressures. Regulators and investors continue to seek more useful emissions information, while governments are also trying to limit administrative burdens and prevent smaller companies from receiving disproportionate data requests through larger customers.
Questions over governance have accompanied the technical debate. A senior resignation earlier this year increased scrutiny of the GHG Protocol revision process, particularly around transparency, decision making, and the treatment of contested technical proposals.
The consolidated timetable provides a clearer structure, but it also places more responsibility within one programme. Decisions on organisational boundaries, base year recalculations, purchased energy, supplier information, and market instruments could alter reported emissions trends even where underlying operational performance has not changed.
That prospect affects transition plans, executive incentives, sustainability linked finance, procurement targets, and public claims. A company that has built its reduction pathway around one accounting treatment may have to restate historical information or revise future targets if the final standard changes how emissions are recognised.
Closer coordination between finance and sustainability functions is likely to follow. Climate data increasingly feeds annual reports, regulated disclosures, lending agreements, customer questionnaires, and internal investment decisions. Weak controls over methodologies, estimates, or data ownership can create financial and governance risks alongside reputational exposure.
Audit and assurance requirements will add further pressure. As emissions figures become more closely connected to regulated reporting and financial products, companies will need to demonstrate not only how totals were calculated but also how source data was collected, reviewed, and approved.
The long development timetable gives organisations an opportunity to improve those systems before the final standard is published. Mapping data sources, documenting assumptions, identifying reliance on estimates, and creating assurance ready controls can reduce the disruption caused by later changes.
Suppliers will also feel the effect, particularly where large customers require product or company level emissions information. A clearer common framework could reduce contradictory questionnaires, although the quality of reporting will still depend on whether smaller companies have the resources and systems to produce reliable data.
The intended result is a more coherent global accounting infrastructure rather than a new corporate emissions target. Comparability will depend on the technical decisions made during consultation and on how consistently regulators, target setting bodies, assurance providers, and companies adopt the final framework.
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