The GHG Protocol became the default global standard for corporate emissions reporting largely because customers and regulators converged on it, not because manufacturers asked for another framework. What Scope 1, 2, and 3 actually separate, and why Scope 3 is the hardest to measure.
92% of Fortune 500 companies responding to CDP climate disclosures
use the GHG Protocol directly or indirectly — which means a Tier 2 or
Tier 3 manufacturing supplier increasingly gets asked for emissions
data in a specific, standardized format, whether or not that supplier
has ever heard of the framework driving the request.
The Greenhouse Gas (GHG) Protocol Corporate Standard is a framework
for measuring and reporting greenhouse gas emissions, covering
accounting for the seven gases addressed under the Kyoto Protocol. It’s
become the de facto global standard for corporate emissions reporting
— not because it’s legally mandated everywhere, but because customer
and investor demand for standardized emissions data has made it the
common format nearly everyone reports against.
| Scope | What it covers |
|---|---|
| Scope 1 | Direct emissions from sources a company owns or controls, like on-site fuel combustion |
| Scope 2 | Indirect emissions from purchased electricity, steam, heat, or cooling |
| Scope 3 | All other indirect emissions across the value chain — including from suppliers and customers |
Scope 3 is where most manufacturers actually get pulled into this
framework — a large customer reporting its own Scope 3 emissions needs
emissions data from its suppliers to complete that picture, which means
the request for “your Scope 1 and 2 emissions” often originates from a
customer’s own Scope 3 reporting obligation, not from the supplier’s
own regulatory requirement.
The GHG Protocol’s Scope 2 Guidance specifically standardizes how
companies calculate and report emissions from purchased energy —
necessary because electricity’s emissions intensity varies dramatically
depending on the local grid mix, and without a standardized calculation
method, two facilities using the identical amount of electricity in
different regions could report wildly different, and not directly
comparable, Scope 2 numbers.
See our related guide on ISO
50001 energy management for the operational side of this — a
facility that’s already tracking and managing its energy consumption
under ISO 50001 has most of the underlying data a GHG Protocol Scope 1
and 2 report actually requires, since energy use and direct emissions
are closely linked.
GHG Protocol reporting itself isn’t a standalone course in SCMEP’s
current catalog — it connects to our Sustainability
Starter Workshop and energy programs for manufacturers. As a
NIST Manufacturing Extension Partnership affiliate
serving South Carolina manufacturers since 1989, our focus is
helping suppliers understand what a customer’s emissions data request
actually requires before scrambling to respond to one.
If your company is receiving customer requests for emissions data,
you can browse the Supply
Chain and Sustainability training catalog or email
the training
team.
The GHG Protocol establishes how to measure emissions; a separate compliance framework asks manufacturers to trace mineral sourcing instead. See our related guide on conflict minerals and Dodd-Frank Section 1502 for the sourcing due-diligence rule.
The GHG Protocol measures a company’s overall annual emissions; a related methodology measures one specific product’s footprint across its full life. See our related guide on Life Cycle Assessment for the product-level alternative to corporate emissions accounting.
The Greenhouse Gas Protocol Corporate Standard is the most widely used global framework for measuring and reporting corporate greenhouse gas emissions, covering the seven gases addressed under the Kyoto Protocol.
Scope 1 covers direct emissions from sources a company owns or controls. Scope 2 covers indirect emissions from purchased electricity, steam, heat, or cooling. Scope 3 covers all other indirect emissions across the value chain, including suppliers and customers.
A large customer reporting its own Scope 3 emissions needs emissions data from its suppliers to complete that picture. The request for a supplier’s Scope 1 and 2 data usually originates from the customer’s own Scope 3 reporting obligation.
A facility already tracking energy consumption under ISO 50001 has most of the underlying data a GHG Protocol Scope 1 and 2 report requires, since energy use and direct emissions are closely linked.
