The concept of a carbon budget quantifies the:

Thecarbon budgetdefines themaximum cumulative amount of CO₂ emissionsallowed tolimit global warming to a specific temperature threshold, such as 1.5 °C or 2 °C above pre-industrial levels. CFA materials emphasize that this budget is afinite global allocationof emissions that can be emitted while still maintaining areasonable chanceof staying within these warming limits. It is distinct from reaching net zero at a specific date (A) or the broader planetary boundary concept (B), although it relates to climate stability within those boundaries.