How GHG Protocol updates and ISO partnership reshape emissions reporting

What's new in global carbon standards

 European Commission unveils revised draft simplified ESRS and VSME standard
  • 4 minute read
  • August 24, 2026

The Greenhouse Gas (GHG) Protocol is the world's most widely used corporate emissions standard. First published in 2001, it is now rolling out three significant updates to its corporate standards, representing a fundamental evolution in how companies measure, report, and communicate their GHG emissions. Importantly, these updates are part of a broader initiative being shaped by a landmark partnership with the International Organization for Standardization (ISO), thereby reshaping how global carbon accounting will work. This pivotal announcement is expected to bring together the practical usability of the Protocol with the regulatory credibility of ISO standards, particularly when the market is increasingly demanding clarity on how emissions are measured and reported. 

Currently, multiple frameworks exist across the accounting landscape, including GHG Protocol Scope 1, 2, and 3, separate Actions and Market Instruments guidance, and ISO 14064 standards. This fragmentation creates confusion, duplication, and inconsistency across organisations and supply chains, making it difficult for investors to compare carbon data reliably across companies. This strategic partnership is aimed to directly address these market demands, delivering greater consistency, comparability, and transparency in emissions measurement and reporting. Understanding what each of these three updates delivers is essential for companies preparing for this shift in global carbon standards.

3 main updates to the GHG Protocol

Companies purchasing renewable energy face a fundamental challenge in how to account for these purchases under Scope 2 emissions reporting. Aligned with feedback from a global consultation process, the Protocol is now developing multiple credible reporting pathways that companies can adopt based on their circumstances. Rather than enforcing a single approach, organisations will have guided options including market-based methods that reflect renewable energy procurement, location-based methods that show grid average emissions, and consequential approaches that align with specific renewable contracts. This flexibility allows investors to understand the methodology each company has chosen and compare renewable energy strategies fairly across the market.

The Actions and Market Instruments (AMI) framework, an existing component of the GHG Protocol, is being refined and strengthened. Currently, when a company reports an emissions reduction, stakeholders cannot easily distinguish whether that reduction resulted from operational improvements or the purchase of carbon offsets. The enhanced AMI framework addresses this challenge through a multi-statement reporting approach. Companies will now report three distinct elements: the first statement shows physical emissions, representing what the organisation actually emits from its operations and value chain; the second statement displays market-based emissions, which accounts for offsets, renewable energy certificates, and other market instruments the company has purchased; the third statement presents the real-world GHG impact, demonstrating the actual emissions reductions that the organisation’s investments and business decisions are achieving. By separating these three components, stakeholders gain a complete picture of corporate climate performance and can identify genuine climate commitment rather than accounting adjustments alone.

The GHG Protocol's Scope 1, 2, and 3 standards currently exist as separate documents, alongside ISO's independent 14064-1 standard. This separation creates operational inefficiencies across the market. The GHG Protocol and ISO are consolidating all corporate carbon accounting standards into a single co-branded standard, with an integrated public consultation planned for Q2 2027. This unified standard will bring together all elements of corporate emissions accounting into one coherent framework. The significance of this consolidation, and how the ISO partnership amplifies its impact, is explored in detail below.

The ISO partnership and why it matters

The three updates represent some important improvements to carbon accounting. However, their real transformative potential lies in how they are being delivered through the ISO partnership. This collaboration does more than validate the updates; it amplifies their credibility, accelerates their adoption, and ensures they become the global baseline for emissions accounting. By combining ISO's regulatory authority with the GHG Protocol's practical usability, this partnership creates a framework that is both rigorous and implementable across all sectors and geographies, in turn facilitating a more harmonised adoption of the regulations and a more unified market transition:

Regulatory pressure for harmonised carbon standards is intensifying globally with both EFRAG (through CSRD) and the ISSB (through IFRS S1 and S2) demanding clearer carbon data and setting global baselines for sustainability disclosures. In parallel, ISO standards have gained significant regulatory influence across multiple jurisdictions and are already embedded in government legislation and regulation across many countries, forming the foundation for emissions reporting frameworks in various sectors. By aligning the GHG Protocol with ISO, these updates become aligned with regulatory requirements across multiple markets. This reduces the risk of future regulatory disruption and, for companies operating across multiple jurisdictions, eliminates the complexity of managing region-specific requirements and ensures consistent global compliance.

 

The ISO partnership synchronises the global market transition, helping stakeholders move forward together. When the consolidated standard is released in Q2 2027, companies, investors, suppliers, and regulators are expected to align around one framework. It’s  recognised that fragmented standards create operational inefficiency, higher compliance costs, and supply chain complexity. Under the unified standard, one standardised emissions dataset is expected to meet requirements across all customer relationships, potentially reducing administrative burden and improving data quality. At the same time, investors are increasingly refusing to accept inconsistent carbon data and demand comparable, credible emissions information to deploy capital effectively in the transition to a low-carbon economy. With one consolidated standard, investors hope to gain consistent, comparable data across their entire portfolio, enabling informed capital allocation toward authentic climate action. For the first time, there is a clear path to consistent, credible emissions reporting across corporate, product, and supply chain levels.

 

How can we help?

Equipped with expertise in both the GHG Protocol and ISO standards, we can support organisations through this transition with practical guidance. Whether you are seeking to measure your carbon footprint, capture scope 3 data, obtain external assurance on your current emissions reporting, or seeking to optimise your carbon accounting strategy, we can provide tailored support that helps you deliver credible, comparable results aligned with global standards.

Contact us

Norbert Paul Vella

Norbert Paul Vella

Assurance Partner, PwC Malta

Tel: +356 9945 3843

Carl  Zammit la Rosa

Carl Zammit la Rosa

Manager, Advisory, PwC Malta

Tel: +356 7973 8459

Michael Dingli

Michael Dingli

Manager, Assurance, PwC Malta

Tel: +356 2564 2314

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