Revealed: UK relied on £2bn of ‘questionable accounting’ to hit its climate-aid goal

The UK pledged at least £11.6bn for climate finance in developing countries between 2021-22 and 2025-26. It later announced that it had exceeded the goal, reporting total climate finance of £12.8bn. This appeared to show that the UK had met its international climate-aid commitment.

The key change was to broaden the definition of climate spending. In 2023, the Conservative government allowed existing funding for development banks, private-sector investment and war-torn countries to be counted. Around £2.1bn was therefore included without coming from new spending on climate projects.

Without the reclassification, cumulative climate finance would have reached only about £10.7bn. That would have left the UK roughly £924m short. The Labour government has kept the approach while planning further aid cuts, raising concerns about whether headline commitments will produce genuinely additional climate and nature outcomes.

Climate finance means funding provided to help developing countries tackle climate change. In the article, it is treated as a form of overseas aid and investment that supports climate-related work. The funding is important because developing countries are expected to need outside financial help while responding to climate change.

The UK’s commitment covered climate finance delivered between 2021-22 and 2025-26. It counted money directed through development banks, private-sector investment and aid programmes. Funding for Afghanistan, Sudan and other war-torn countries was also included after the government loosened its criteria for climate spending.

The dispute is not about whether climate finance matters. It is about whether every pound counted was genuinely new and additional. Critics argue that relabelling existing aid can inflate the headline total without providing more resources for climate projects in developing countries.

The UK reported £12.8bn in climate finance over the five-year period ending in 2025-26. Carbon Brief’s analysis found that around £2.1bn of this total came from accounting changes. That is nearly one-fifth of the reported amount, making the adjustment large enough to determine whether the target was met.

The adjustment did not mean that all £2.1bn was newly allocated to climate projects. Instead, the government changed how some existing funds were classified. These included funding for development banks, private-sector investment and aid for Afghanistan, Sudan and other war-torn countries. The money was then counted as climate finance.

The figure exceeded an earlier estimate from the Independent Commission for Aid Impact. In 2024, the watchdog forecast that reclassified climate finance would reach £1.7bn. Carbon Brief’s analysis put the final adjustment at £2.1bn.

The accounting changes covered several types of funding that had not originally been presented as new climate spending. They included existing contributions to development banks, money connected with private-sector investment and aid for countries affected by war. Afghanistan and Sudan were specifically named, along with other war-torn nations.

The mechanism was a broader definition of what counted as climate spending. In 2023, the Conservative government loosened the criteria for climate finance. This allowed existing funds to be relabelled and included in the £11.6bn target, even though they were not necessarily new projects created for that commitment.

The current Labour government has maintained this approach. The government says the method is consistent with internationally agreed ways of calculating international climate finance, which are also used by other major donors. Critics say it weakens the credibility of the target.

Without the government’s accounting changes, the UK would not have met its £11.6bn climate-finance target. Carbon Brief calculated that cumulative finance would have reached around £10.7bn by 2026. The resulting shortfall would have been approximately £924m, despite the government’s reported total of £12.8bn.

The difference matters because international climate finance is meant to be new and additional. That generally means extra funding on top of existing aid, rather than money transferred into a new category. Reclassifying existing programmes can therefore make the total look larger without increasing the resources available for climate action.

For developing countries, this affects the credibility and potential scale of support. The International Development Committee said the UK’s aid cuts and accounting changes had eroded climate finance’s additionality and credibility. The issue remains important as the UK plans another £6bn for climate projects over three years.

The UK and other developed countries are expected under UN climate treaties to provide “new and additional” climate finance. This is generally understood as funding added on top of existing overseas aid. The principle matters because developing countries need resources that are genuinely available for climate action, not simply moved between accounting categories.

The UK cut its foreign-aid spending while keeping the £11.6bn climate-finance target. In 2023, it loosened the rules defining climate spending. Existing funding for development banks, private investment and war-torn countries could then be counted toward the target, contributing about £2.1bn of the reported total.

The government says its approach follows internationally agreed calculation methods used by other donors. However, the aid watchdog, campaigners and MPs called it creative or questionable accounting. The International Development Committee said the changes, alongside aid cuts, eroded the additionality and credibility of UK climate finance.

International climate agreements create the basic expectation. The UK and other developed countries must provide new and additional climate finance to developing countries. They also support wider mobilisation targets, including $100bn annually through 2025 and at least $300bn by 2035. The UK translated its obligation into an £11.6bn national target.

The money comes from the overseas-aid budget. When governments cut that budget, the fixed climate target becomes harder to meet. The UK responded by loosening its definition of climate spending in 2023. It could then count existing development-bank funding, private investment and aid programmes alongside new climate projects.

Accounting rules determine the final reported figure. The government says its method matches internationally agreed calculations used by other donors. Critics argue that this approach conflicts with the idea of additional funding. The issue will continue as the UK cuts aid further and begins a new £6bn climate-aid programme.