Carbon offset
A carbon offset is the use of a greenhouse gas emission reduction, avoidance, or removal achieved outside a defined footprint boundary to compensate for emissions remaining within that boundary. The governing programme determines eligibility, quantification, verification, ownership, retirement, and the claim the user may make.
In simple terms
Offsetting links a residual emission to a mitigation outcome elsewhere. That outcome is usually quantified under a crediting methodology and represented by a carbon credit, which is retired so it cannot be used again. Quality depends on factors such as additionality, robust quantification, permanence, leakage management, independent verification, and avoidance of double counting. Offsetting does not physically erase the original emission, and credible climate strategies prioritize direct reductions before compensation.
Why it matters
Offsets can direct finance to mitigation outside an organization’s boundary and may help address residual emissions under a defined carbon neutrality programme. Poor-quality units or vague claims can overstate climate benefit. Buyers need to understand the crediting programme, project, vintage, registry status, corresponding accounting, and exactly what the retirement supports them to claim.
Example
For example, an event organizer can calculate and reduce its bounded footprint, then retire eligible credits from a registered removal activity for the stated residual amount. It records the programme, project, serial numbers, quantity, vintage, and claim language rather than implying that the event produced no emissions.
How it differs
Carbon credit
A carbon offset is the act or mechanism of compensating emissions with an external mitigation outcome; a carbon credit is the serialized tradable unit that may be purchased and retired for that purpose.