On 09 September, the GHG Protocol and ISO announced a new partnership to create a unified global standard for greenhouse gas emissions accounting, covering Scope 1, 2 and 3. This collaboration between two of the world’s most trusted standard setters is a milestone moment, offering the chance to reduce fragmentation, strengthen the foundations of carbon accounting, and accelerate mainstream adoption.  

‍PACT’s role in building momentum

At PACT, we believe lasting decarbonization begins with trusted and comparable data. Built on and aligned with both the GHG Protocol and ISO 14067, the PACT Standard provides a consistent and interoperable methodology for product carbon footprints (PCFs). Today, more than 2,500 companies across industries and geographies have adopted the PACT Standard to calculate and exchange thousands of accurate and comparable PCFs. With 150+stakeholders engaged across business, policy, finance, and academia, PACT has become the world’s leading Standard for product carbon footprints (PCFs), drawing strength from its integration with GHG Protocol and ISO.

Momentum is also accelerating in the Asia-Pacific region, where businesses and governments are turning to PACT to align with global standards and scale decarbonization. Our partnership with the Singapore Business Federation (SBF), announced in May 2025, is a clear example of this growing regional leadership.

This progress has shown us two things: harmonization is possible, and businesses increasingly recognize the value of PCF-led decarbonization.  

PACT warmly welcomes this collaboration, which promises harmonized, granular, and transparent data to guide decarbonization efforts across industries. We are thrilled by what this means for our community, and mindful of the responsibility it brings. Drawing on our community’s pilot projects, open-source tools, and practical expertise, we stand ready to support and shape the emerging standard. ‍

What does this mean for the carbon accounting landscape?

The alignment of the GHG Protocol and ISO brings a new era of harmonized and scalable carbon accounting. By integrating corporate, project and product-level carbon accounting standards and portfolios into a unified framework, the partnership addresses long-standing fragmentation and provides a platform for future co-development. Organizations will benefit from a unified global language for emissions measurement, simplifying processes, reducing reporting burdens and improving policy coherence.

Crucially, the collaboration also supports enhanced data granularity. A standardized approach to supply-chain emissions will surface the detailed insights businesses need to identify hotspots and focus efforts where they matter most.

These outcomes directly support PACT’s mission: empowering businesses worldwide with transparent, comparable and actionable data to accelerate real decarbonisation.

Next steps for our community

As we wait for the announcement of the organizational structure and working groups that will guide the GHG Protocol and ISO partnership, PACT will keep its community closely informed. We will continue to share opportunities for engagement, and highlight how PACT will contribute to shape these unified standards and support harmonization across industries.

In the meantime, you can:

1. Join PACT’s Implementation  Program and help shape the next phase of product carbon footprint guidance (for more info,     email: pact@wbcsd.org)
2. Explore PACT’s available resources, and engage during our upcoming     member meetings and workstream working groups

With GHG Protocol and ISO aligned, the path to truly comparable and accurate product footprints is becoming clearer . As a strong community of real-life players, we can ensure these standards work in practice and accelerate real decarbonization at scale.