STATUTORY CARBON BUDGETS

Lawmakers limit the total greenhouse-gas emissions permitted over each of a series of multi-year periods and make government legally responsible for meeting those limits. Each carbon budget sets the cumulative quantity allowed during the period, rather than only an emissions level to reach in its final year. A net budget subtracts eligible removals from emissions; a gross budget limits emissions before that deduction. Successively tighter budgets bring the long-term climate goal into nearer-term decisions about regulation, public spending and CDR deployment. The budget is measured in tonnes and does not itself allocate money or require companies to purchase removals.

Lawmakers must specify the period, gases and territory covered, how successive caps are set, and which ministers answer for compliance. They should state whether removals count, which forms qualify, and how overseas credits and later losses of stored carbon affect the account. Separate reporting of emissions and removals exposes reliance on uncertain future supply. The law can require delivery plans, independent scrutiny and corrective action when forecasts show a breach. Any permission to carry unused emissions into a later period, borrow from a future cap or revise a budget needs explicit limits and public justification.

A cumulative limit makes delay consequential because emissions early in the period leave less room later. Ministries can test whether their combined plans fit within the cap and identify missing action before the period ends. Where eligible removals contribute, the government must confront how many tonnes it expects, when they can arrive and what measures will deliver them. Setting several budgets ahead gives land managers, infrastructure planners and removal suppliers a clearer view of the intended policy direction.

Government may adopt a demanding cap while relying on unfinanced removal projects or unrealistic forest growth to meet it. Broad credit eligibility can conceal inadequate domestic action, while revisions and generous transfers between periods can erase the consequences of delay. A budget can also be met partly because of an economic downturn rather than durable policy improvements. Weak enforcement may leave ministers reporting a breach without correcting its causes.

Annual reports should compare cumulative accounted emissions with the remaining budget and explain changes in gross emissions, removals and international credits separately. Forecasts should test whether funded policies can close the gap. Independent review should identify the correction needed, the responsible minister and the response deadline, while preserving a clear record of revisions and any final overshoot.

Finance and sector ministries should test delivery plans against the shared cap and identify responsibilities. Inventory teams and independent advisers should scrutinise accounting and removal assumptions. Businesses, land managers, workers and affected communities should assess feasible changes and who bears their costs. Legislatures should examine the proposed budgets and ministers' responses to missed progress.

Supranational, national and regional/state lawmakers can establish statutory emissions budgets within their legislative powers and assign responsibility to the relevant executive authorities. Where territories overlap, compatible accounting and clear responsibility prevent one government's planned contribution from concealing another's shortfall. Regional/state implementation depends on sufficient legislative authority to impose continuing climate duties; a voluntary local emissions plan does not establish the same legal obligation.