Policy and regulation
In a direct and powerful response to the global fragmentation of sustainability reporting standards, a landmark consolidation was announced to the market on July 29, 2026. The Greenhouse Gas (GHG) Protocol and the International Organization for Standardization (ISO) confirmed they will merge their respective corporate carbon accounting standards into a single, harmonized, and co-branded global standard29.
This strategic partnership, positioned as a key milestone of the upcoming COP30 Action Agenda, aims to untangle the complex web of parallel accounting methodologies that have plagued multinational corporations, auditors, and regulators for the past decade. The unified standard will comprehensively integrate the GHG Protocol’s legacy foundational frameworks—including the original Corporate Standard (2004), the Scope 2 Guidance (2015), the universally referenced Scope 3 Standard (2011), and the recent Actions and Market Instruments workstream—with the highly technical ISO 14064-1 standard30.
By combining the widespread market adoption of the GHG Protocol with the rigorous, auditable engineering standards of ISO, the organizations intend to eliminate duplication, enhance data interoperability, and provide a singular, unimpeachable source of truth for global climate reporting and financial decision-making30. This harmonization is expected to drastically simplify the assurance process, allowing third-party auditors to verify carbon inventories against a unified global benchmark rather than navigating jurisdictional discrepancies.
The integration process is slated for a deliberate, multi-year development cycle. According to the newly released Standard Development Plan, an integrated public consultation is scheduled for the second quarter of 2027, allowing for extensive stakeholder feedback from both financial and industrial sectors29. The final consolidated standard is expected to be formally published in the fourth quarter of 2028, operating in a two-part structure accompanied by extensive implementation guidance30. In the interim, the announcement provides a clear, vital signal to carbon accounting software providers, financial auditors, and corporate sustainability officers that current investments in carbon tracking infrastructure must be designed with the agility to adopt a centralized, ISO-backed methodology by the end of the decade.
Summary of publicly reported developments, current at the time of writing. Not investment, legal or tax advice. Verify every figure against the instrument in force before relying on it.
