In legal practice, this describes, in non‑UK and non‑Irish regimes, a nationally determined cap on the total volume of greenhouse gas emissions permitted over a defined period, expressed as a net quantity of carbon dioxide equivalent (CO2e). It is commonly created by, or under, national climate change legislation and fixed by government instrument (for example, ministerial decree, regulation or cabinet decision).
The term is often expressly defined in statute in those jurisdictions and used across multiple legal contexts: setting economy‑wide or sectoral limits; guiding policy, permitting and procurement; informing carbon trading schemes; and featuring in climate litigation and regulatory compliance.
Key features typically include: a multi‑year budget window; coverage of specified gases; accounting rules for removals and land use; treatment (if any) of international credits; and oversight by a designated authority. Legal force varies: some budgets are binding with enforcement or remedial duties, others are indicative planning tools.
Usage is broadly consistent with the UK concept of statutory carbon budgets, but practitioners should confirm, for the relevant jurisdiction, the legal status, scope, accounting methodology and interaction with emissions trading caps or offset regimes.