Residual emissions
Residual emissions are greenhouse gas emissions that remain after an organization, activity, or system has applied feasible emissions reductions within a defined boundary and target period. They are the remaining quantity to be addressed under a net-zero framework, whose rules determine eligible scope, timing, accounting, and any balancing through removals.
In simple terms
Residual emissions are not simply emissions an organization prefers to keep. They are identified only after the boundary, baseline, reduction pathway, and available abatement measures have been defined. What qualifies as residual can differ between frameworks and may change as technology, policy, and feasibility evolve. Climate mitigation should reduce emissions as deeply as the applicable pathway requires before any remainder is balanced. Net zero then concerns the overall target state, including how that remainder is treated under the chosen framework.
Why it matters
Calling emissions residual too early can weaken a transition pathway and shift attention from direct reductions to future balancing. A transparent residual estimate helps decision-makers test whether reduction options were exhausted, plan credible removals, disclose uncertainty, and avoid presenting a Carbon neutrality or Net zero claim without a clear boundary and treatment of remaining emissions.
Example
A manufacturer maps its operational and value-chain emissions, follows a reduction pathway, replaces equipment, improves Energy efficiency, and works with suppliers. It classifies only the remaining emissions that meet its chosen framework's criteria as residual, documents why they remain, and separately explains any removals used to balance them.
How it differs
Net zero
Residual emissions are the emissions remaining after applicable reductions; Net zero is the target state in which an eligible remainder is balanced according to a defined framework.