EHS glossary>Safety term

The Definition of Carbon Offset

A carbon offset, or carbon credit, represents one tonne of CO2e that has been reduced, avoided or removed from the atmosphere by a project outside a company's own operations.

Plain-English definition
Real-world example
Carbon Offset definition

Definition of a Carbon Offset

A carbon offset, often called a carbon credit, is a tradable certificate representing one metric tonne of carbon dioxide equivalent (CO2e) that has been avoided, reduced or removed from the atmosphere by a project. Companies buy and "retire" credits to compensate for emissions they have not yet eliminated.

Types of Carbon Offset Projects

  • Avoidance and reduction: renewable energy projects, efficient cookstoves, methane capture at landfills.
  • Nature-based removals: reforestation, improved forest management, soil carbon.
  • Technological removals: direct air capture, biochar and enhanced rock weathering.

What Makes a High-Quality Offset

  • Additionality: the reduction would not have happened without the credit revenue.
  • Permanence: the carbon stays out of the atmosphere for a long time.
  • No leakage: emissions are not simply moved elsewhere.
  • Independent verification under a recognized standard and registry.
  • No double counting of the same tonne.

Example of a Carbon Offset

A professional services firm reduced its office energy and travel emissions, then bought verified removal credits from a biochar project to cover its remaining footprint, retiring them in a public registry.

Frequently Asked Questions: Carbon Offset

Can offsets replace emission reductions?

No. Leading standards, including those for net zero, require companies to cut their own emissions first.

What does retiring a credit mean?

Retiring a credit permanently removes it from circulation in a registry so it cannot be sold or claimed again.

Why are offsets controversial?

Some projects have been found to overstate their impact. Poor-quality offsets used in marketing claims can lead to accusations of greenwashing.

Part of SafetyIQ's EHS glossary: plain-English definitions of workplace health and safety terms.

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