COP30: ISO and GHG Protocol Unite to Harmonize Carbon Accounting Standards by 2028

Why Harmonization Matters Now

As demands for climate disclosures grow across markets from the EU’s CSRD to the SEC’s proposed climate rule in the U.S., businesses are increasingly being held accountable for their greenhouse gas (GHG) emissions, especially Scope 3. Yet, a fragmented landscape of standards and methodologies has led to inconsistent data, inflated costs, and diminished trust.

This confusion not only undermines market credibility, but also stalls real progress. Harmonized standards are essential for:

• Transparency in climate disclosures

• Comparability across markets and sectors

• Reliable data for informed policy, investment, and procurement decisions

• Effective decarbonization strategies based on accurate, actionable insights

What’s Changing? Key Actions from ISO and GHGP

The new action plan includes the following commitments by 2028:

Co-Branded Global Standards

ISO and GHGP will develop jointly branded, science-based standards for:

• Corporate emissions (Scopes 1, 2, and 3, including market-based instruments)

• Product-level carbon footprints

• Project-based accounting (especially for offsets and removals)

Joint Coordination Group

A newly formed Joint Coordination Group will oversee the alignment process, ensuring transparent, inclusive, and equitable stakeholder participation. This governance model draws in voices from business, academia, civil society, and technical experts.

Tools and Implementation Guidance

Alongside updated standards, the partnership will deliver practical Measurement, Reporting and Verification (MRV) tools, boundary-setting guidance, and sector-specific emissions factors to ensure real-world application.

Integration of Emerging Solutions

The harmonized framework will also incorporate bioeconomy, forestry, tropical agriculture, and carbon removal pathways making them more accessible and measurable within mainstream climate strategies.

Implications for Business and Policy

This collaboration sets the stage for:

• Smarter policy-making rooted in consistent, high-quality data

• Investors and regulators to compare disclosures confidently across jurisdictions

• Businesses of all sizes to participate in carbon markets and procurement systems without being hindered by methodological inconsistencies

• Supply chain transparency, allowing for more strategic and impactful procurement decisions

What This Means for the 2030 Climate Goals

While this harmonization initiative won’t directly deliver emissions reductions, it removes a critical systemic barrier: the current lack of comparability and interoperability in carbon data. By strengthening the global infrastructure for emissions reporting and regulation, it accelerates every other part of the net-zero journey from finance and disclosure to procurement and innovation.

Final Thought

At COP30, the focus is rightly on action. But action without clarity, consistency, and trust falls short. This bold step from ISO and GHGP is not just a technical update it’s a catalyst for climate credibility. As the world moves from pledges to performance, harmonized carbon accounting is the silent enabler that will allow every tonne of CO₂ to count literally and strategically.