The sustainability world truly is in freefall, when something like the standardisation or opening of communication between ISO and GHGP is considered big.
Not long ago, the alphabet soup of sustainability frameworks — GRI, SASB, CDP, CDSB, and others — finally converged to form the ISSB and CSRD. It was a long, attention-grabbing process to hammer out something resembling a standardised approach to reporting.
But here’s the thing: regulatory and framework-led change rarely sparks real transformation. They create compliance checklists, not cultural shifts. Companies dutifully file their reports, tick their boxes, and move on — but the needle on actual impact barely budges. These efforts might tidy up the paperwork, but they aren’t driving the deep, systemic change that sustainability truly demands.
Firstly, it’s not too apparent what the difference is, given that most large global enterprise already incorporate both in their emissions inventory.
GHGP vs ISO
The GHG Protocol Corporate Standard and ISO 14064-1:2018 both help organisations measure and report greenhouse gas emissions, but they serve slightly different purposes. The GHG Protocol is the most widely used—it’s detailed, highly prescriptive, and comes with calculation tools, sector guidance, and strong alignment with disclosure frameworks like CDP and SBTi. It’s great for internal management and voluntary reporting, but verification is optional.
ISO 14064-1, on the other hand, is part of a broader ISO series. It’s less prescriptive and more flexible, allowing organisations to choose the methods that make the most sense for them. Its real strength is credibility—it’s designed to work hand-in-hand with ISO 14064-3, which sets requirements for independent third-party verification.
In practice, many companies use both: GHG Protocol for detailed calculations and ISO 14064-1 when they need externally assured, certification-ready reporting.
The GHG Protocol Corporate Standard, developed by the World Resources Institute (WRI) and the World Business Council for Sustainable Development (WBCSD), provides a single, consolidated framework for organisational GHG accounting. It includes detailed, sector-specific guidance and offers calculation tools that cover all scopes of emissions, including Scope 3, which deals with value chain emissions. It also addresses “avoided emissions,” allowing organisations to recognise reductions achieved outside of their direct footprint. This makes the GHG Protocol highly practical for companies seeking structured methodologies alongside industry-tailored resources.
ISO 14064-1:2018 is part of the broader ISO 14064 series. The series is divided into three parts:
ISO 14064-1 emphasises structured processes, comparability, and flexibility. Rather than prescribing exact calculation methods, it allows organisations to tailor their inventories to what is most relevant and material to them. This adaptability is valuable for companies with complex or unique operations.
It's more about getting the numbers independently verified
One of the most striking distinctions between the GHG Protocol and ISO 14064-1 lies in how they handle verification and assurance. The GHG Protocol champions transparency and accuracy but treats verification as optional. Organisations can rely on internal checks or choose to bring in independent auditors, yet there is no built-in requirement to do so.
ISO 14064-1, by contrast, is built with independent verification at its core. Its companion standard, ISO 14064-3, lays out detailed requirements for how third-party verification should be conducted. This makes ISO-based reporting particularly valuable for organisations seeking compliance, building investor confidence, or pursuing formal certification. More verified data points ultimately benefit shareholders, investors, and the broader financial sector, giving accountants the opportunity to validate and interpret results with greater confidence.
The two frameworks also differ in their level of prescriptiveness. The GHG Protocol is highly detailed and structured, offering calculation methods, emission factors, and industry-specific guidance. It even includes explicit recognition of avoided emissions, which is particularly useful for companies developing low-carbon solutions. ISO 14064-1 takes a more principle-based approach, giving organisations the flexibility to choose methodologies that best fit their context. This flexibility makes it an attractive option for multinational companies or those with complex operations seeking tailored, relevant reporting.
Follow our new series analysing British companies and their approach to GHG accounting
Anyway, if you are still reading this, then I suspect you might be as big a sustainability nerd as me, so we are going to do a deep dive analysis of British Companies and their approach to GHGP and or ISO, given the latest findings that a ridiculously large number of those businesses had to restate their reported emissions footprints. Why? Because they don’t understand GHGP vs ISO? They don’t have relevant systems, processes and controls? They don’t use auditable solutions to support their disclosure? We shall discuss each week as a case study.
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