How to build a GHG Inventory: tools, frameworks and best practices
If you can’t measure it, you can’t manage it and when it comes to cutting carbon, a GHG inventory is where it all starts. Think of it as your climate balance sheet: a clear, credible record of every tonne of greenhouse gas your organisation is responsible for.
Here’s how to build one that’s accurate, auditable, and ready for action.
1. Know your “Why”
Are you reporting for compliance, investor confidence, target-setting, or stakeholder engagement? Your purpose will shape the scope and detail of your inventory.
2. Set your Boundaries
Decide which parts of your business are in scope:
- Scope 1 – Direct emissions from sources you own or control.
- Scope 2 – Indirect emissions from purchased energy.
- Scope 3 – Other indirect emissions across your value chain.
- (Optional) Scope 4 – Avoided emissions from climate-positive products or services.
3. Use the Right Framework
Global standards like the GHG Protocol Corporate Standard or ISO 14064 ensure your inventory meets best practice and is comparable across industries.
4. Gather Quality Data
From utility bills to supplier reports, every number counts. Create one central system so all departments feed into the same place.
5. Apply Trusted Emission Factors
Convert your activity data into CO₂e using sources like the UK Department for Energy Security & Net Zero, EPA, or the IPCC. Accuracy here is key.
6. Leverage Digital Tools
Data management platforms can automate data collection and keep an audit trail, especially for large porfolios with numerous data points to process.
7. Keep it Credible
Follow the GHG Protocol’s principles: relevance, completeness, consistency, transparency, and accuracy. Third-party verification can add extra trust.
8. Treat it as a Living System
Your first inventory is your baseline, not your final product. Improve it every year — better data, broader scope, smarter tools.
Final Thought
A great GHG inventory isn’t just about compliance, it’s the foundation for real climate action. The more clearly you see your emissions, the more confidently you can cut them.
