The UK government’s spending on climate aid reached its highest-ever level last year, with more than £1.8bn channelled into projects aimed at cutting emissions and boosting resilience in developing countries.
The new data, released to Carbon Brief via freedom-of-information (FOI) requests, reveals how “international climate finance” (ICF) was dispersed in the financial year 2023-24. This builds on larger Carbon Brief analysis tracking ICF spending back to 2011.
UK aid money was, for example, used last year to reconstruct low-carbon power supplies in Ukraine, support flood victims in Pakistan and help Ethiopians facing drought. There were also large contributions to international programmes, such as the Green Climate Fund.
However, despite the record sum, Carbon Brief has identified at least £199m – or 11% – of this money as the result of the government loosening its definition of “climate finance”. This allows the UK to meet its climate-aid targets without providing as much new money.
Carbon Brief understands that this figure is likely an underestimate, because the “provisional” figures provided do not include some of the reclassified humanitarian aid identified in internal documents revealed by a previous FOI request.
Climate finance will be the critical issue at the COP29 UN climate negotiations in Baku, Azerbaijan, later this year. Rich nations are under pressure to increase their overseas climate spending despite many, including the UK, drastically cutting their aid budgets.
Yet, with a general election on the horizon, neither the Conservatives nor their Labour opposition have expressed interest in returning the UK’s aid spending to its previous levels, for the time being.
New record
In 2019 the UK government, led by then-prime minister Boris Johnson, committed to spending £11.6bn on ICF between the financial years of 2021-22 and 2025-26.
This money is the UK’s contribution towards a broader Paris Agreement commitment by developed countries to provide financial support for climate action in developing countries.
Current prime minister Rishi Sunak has reaffirmed this pledge, stating that it is the “right thing to do”. Yet the target has come under considerable strain during his leadership.
In his role as chancellor in Johnson’s government, Sunak announced major cuts to the foreign aid budget – breaching a legal obligation. The government has spent much of the remaining budget on housing refugees, making it even harder to scale up climate spending.
Towards the end of 2023, the government announced that it was broadening its definition of “climate finance”. This allows the UK to stay on track for its pledges without providing as much new money. (See: Accounting changes.)
However, the trajectory the government mapped out to reach £11.6bn still requires annual spending to more than double within five years.
According to the annual figures provided to Carbon Brief, ICF spending reached at least £1.82bn in 2023-24 – an increase of £192m since the previous year. As the chart below shows, this suggests that the UK’s ICF spending will still have to increase significantly over the next two years to stay on track for the £11.6bn goal.

These figures are based on FOI responses from the three major departments responsible for the UK’s overseas climate-related development projects: the Foreign, Commonwealth and Development Office (FCDO); the Department for Environment Food and Rural Affairs (Defra) and the Department for Energy Security and Net Zero (DESNZ). The FCDO is by far the largest contributor, with responsibility for 79% of the ICF spending.
In fact, the total ICF spend in 2023-24 is likely to be at least a little higher than the £1.82bn suggested by the FOI data. According to the government, these numbers are “provisional” and “subject to year-end accounting and audit adjustments”.
This could explain why many of the humanitarian aid projects that were recently reclassified as ICF – as per a previous FOI request by Carbon Brief – do not appear in the data. If these projects are included, they could add tens of millions to the total.
Moreover, Carbon Brief has not been able to obtain data on a handful of “research and innovation” projects that support scientific research in developing countries, which have recently been transferred from DESNZ to the Department for Science, Innovation & Technology (DSIT).
Last year, these projects contributed £7.77m in ICF – amounting to around 0.4% of that year’s total. (Carbon Brief has asked DSIT and FCDO about these projects, but had not received a response at the time of publication.)
Accounting changes
The government has described the £11.6bn goal as “dedicated ring-fenced funding that is distinguishable from non-climate [aid]”. This aligns with the widely held notion that climate finance should be “new and additional”, namely, on top of existing aid programmes.
Nevertheless, in October 2023, the government made three major changes to its ICF accounting in order to inflate its overseas climate spending figures.
The biggest change was including a cut of “core” UK contributions to development banks, such as the World Bank. It also increased the share of British International Investment (BII) input – through which the UK invests in overseas businesses – that counts as ICF.
The third change was labelling 30% of all humanitarian aid provided to the most climate-vulnerable nations as ICF. This applies even if a project has no explicit link to climate action.
In addition, civil servants were tasked with “scrubbing” existing aid projects for any other money that could be counted as ICF, in order to increase the numbers further.
FOI documents released to Carbon Brief earlier this year revealed the details of £1.7bn in funds that the government planned to reclassify as ICF between 2021-22 and 2025-26.
The new data for 2023-24 confirms some of these details. Carbon Brief has identified at least £199m, including funds confirmed separately from the FOI request, which can be attributed to these changes in that year. These figures are “provisional” and may not account for all the changes that have taken place.

The FOI data includes £153.5m that was provided to the BII “programme of support” for companies in Africa, south Asia, the Indo-Pacific region and the Caribbean. Based on a comparison with previously obtained documents, this suggests the UK counted an additional £69.5m of BII investment as ICF in 2023-24, compared to its pre-revision plans for the year.
Carbon Brief could only identify three purely humanitarian projects, contributing a relatively small £4.5m of ICF in 2023-24. This is far less than the £74m identified in government planning documents, previously released to Carbon Brief.
A notable omission from the FOI data is any new funding for multilateral development banks (MDBs), which is expected to make up the biggest chunk of the recently reassigned ICF.
However, the Independent Commission for Aid Impact (ICAI) confirmed to Carbon Brief that, in fact, some MDB funding was included in the UK’s ICF totals last year. Specifically, £48m of contributions to the 16th “replenishment” of the African Development Fund – part of the African Development Bank – has been classed as ICF.
ICAI has also previously confirmed that, according to an internal government document, £77m was “scrubbed” from existing funds and added to the 2023-24 total. (Carbon Brief was not able to identify which projects these came from, based on the FOI response.)
The government has previously argued that their changes to ICF accounting are in line with the methodologies used by other wealthy countries. In response, development experts have said that the UK should be upholding high standards, rather than lowering them to align with others.
At COP29 in November, rich countries will be under pressure to increase the amount of climate finance they provide to developing countries, in particular via a mechanism known as the “new collective quantified goal”. There will also be discussions at the summit in Azerbaijan of establishing tighter guidelines for what counts as climate finance.
With the UK general election taking place next month and Sunak’s Conservative government likely to lose power, the current polling suggests that the opposition Labour party will be leading the country during the key climate finance discussions at COP29.
Labour has not committed to restoring the UK’s foreign aid budget to its former level, in the short term, and neither has it explicitly committed to maintaining the £11.6bn target.
Major recipients
For the first time in the history of the UK’s ICF programme, the government directly contributed climate aid to Ukraine in 2023-24, as part of a wider package to support the war-torn nation.
The UK committed £12.9m of bilateral climate funds towards the Ukraine Resilience and Energy Security Programme – part of a wider £62m package of grants out to the end of 2025 to ensure the “continued operation of Ukraine’s energy infrastructure”.
The first stages of the project focused on immediate repairs and maintenance of the country’s gas and electricity system, including the provision of fossil-fuel generators.
However, the project is also focusing on “pivot[ing] towards rehabilitating infrastructure in a green and energy efficient manner”. This includes money to support renewables, green hydrogen and insulation for homes.
The only country that received more direct, country-to-country ICF funds from the UK last year than Ukraine was Ethiopia. It received £36.8m in bilateral funds, meaning it retains its long-running position as the biggest single-country recipient of UK climate finance.
The east African nation has also been facing significant instability over the past year, as conflict continues following war in the northern Tigray region. Meanwhile, swathes of the country have been struggling with climate change-driven drought.
As the map below shows, much of the remaining bilateral ICF last year went to former colonies in Africa and south Asia, with which the UK continues to foster close relationships. Of the top 10 recipients, seven are members of the Commonwealth association of nations.

Other notable single-country ICF beneficiaries include Pakistan, which received £10m – including £3.3m to help build climate resilience for communities struck by devastating, climate change-driven floods.
Kenya was also a key recipient, with £10.5m to support climate-resilient cities and provide cash transfers to people in drought-affected areas.
Most of the UK’s biggest contributions were to well-established multilateral climate funds and schemes, including a £411m contribution to the first replenishment of the Green Climate Fund. This alone was roughly a quarter of all the climate finance provided last year.
Other major contributions to international efforts in 2023/2024 included a £134.4m injection into the eighth replenishment of the Global Environment Facility (GEF) and £44.1m for the International Monetary Fund’s (IMF) Resilience and Sustainability Trust. The latter is a recently established vehicle for lending to help developing countries prepare for crises.
Developing countries say they need trillions of dollars in annual support to achieve their climate targets under the Paris Agreement, with a preference for grant-based finance. Some wealthy countries have argued that such levels of funding are only possible if a wider selection of countries contribute and there is more emphasis on private-sector funding.
All of these issues will come to a head at COP29 in November, where countries will decide how best to mobilise climate finance in the coming years.
The post Analysis: UK climate aid reaches record £1.8bn in 2023 after loosening rules appeared first on Carbon Brief.
Analysis: UK climate aid reaches record £1.8bn in 2023 after loosening rules
Greenhouse Gases
Heatwaves driving recent ‘surge’ in compound drought and heat extremes
Drought and heatwaves occurring together – known as “compound” events – have “surged” across the world since the early 2000s, a new study shows.
Compound drought and heat events (CDHEs) can have devastating effects, creating the ideal conditions for intense wildfires, such as Australia’s “Black Summer” of 2019-20 where bushfires burned 24m hectares and killed 33 people.
The research, published in Science Advances, finds that the increase in CDHEs is predominantly being driven by events that start with a heatwave.
The global area affected by such “heatwave-led” compound events has more than doubled between 1980-2001 and 2002-23, the study says.
The rapid increase in these events over the last 23 years cannot be explained solely by global warming, the authors note.
Since the late 1990s, feedbacks between the land and the atmosphere have become stronger, making heatwaves more likely to trigger drought conditions, they explain.
One of the study authors tells Carbon Brief that societies must pay greater attention to compound events, which can “cause severe impacts on ecosystems, agriculture and society”.
Compound events
CDHEs are extreme weather events where drought and heatwave conditions occur simultaneously – or shortly after each other – in the same region.
These events are often triggered by large-scale weather patterns, such as “blocking” highs, which can produce “prolonged” hot and dry conditions, according to the study.
Prof Sang-Wook Yeh is one of the study authors and a professor at the Ewha Womans University in South Korea. He tells Carbon Brief:
“When heatwaves and droughts occur together, the two hazards reinforce each other through land-atmosphere interactions. This amplifies surface heating and soil moisture deficits, making compound events more intense and damaging than single hazards.”
CDHEs can begin with either a heatwave or a drought.
The sequence of these extremes is important, the study says, as they have different drivers and impacts.
For example, in a CDHE where the heatwave was the precursor, increased direct sunshine causes more moisture loss from soils and plants, leading to a drought.
Conversely, in an event where the drought was the precursor, the lack of soil moisture means that less of the sun’s energy goes into evaporation and more goes into warming the Earth’s surface. This produces favourable conditions for heatwaves.
The study shows that the majority of CDHEs globally start out as a drought.
In recent years, there has been increasing focus on these events due to the devastating impact they have on agriculture, ecosystems and public health.
In Russia in the summer of 2010, a compound drought-heatwave event – and the associated wildfires – caused the death of nearly 55,000 people, the study notes.

The record-breaking Pacific north-west “heat dome” in 2021 triggered extreme drought conditions that caused “significant declines” in wheat yields, as well as in barley, canola and fruit production in British Columbia and Alberta, Canada, says the study.
Increasing events
To assess how CDHEs are changing, the researchers use daily reanalysis data to identify droughts and heatwaves events. (Reanalysis data combines past observations with climate models to create a historical climate record.) Then, using an algorithm, they analyse how these events overlap in both time and space.
The study covers the period from 1980 to 2023 and the world’s land surface, excluding polar regions where CDHEs are rare.
The research finds that the area of land affected by CDHEs has “increased substantially” since the early 2000s.
Heatwave-led events have been the main contributor to this increase, the study says, with their spatial extent rising 110% between 1980-2001 and 2002-23, compared to a 59% increase for drought-led events.
The map below shows the global distribution of CDHEs over 1980-2023. The charts show the percentage of the land surface affected by a heatwave-led CDHE (red) or a drought-led CDHE (yellow) in a given year (left) and relative increase in each CDHE type (right).
The study finds that CDHEs have occurred most frequently in northern South America, the southern US, eastern Europe, central Africa and south Asia.

Threshold passed
The authors explain that the increase in heatwave-led CDHEs is related to rising global temperatures, but that this does not tell the whole story.
In the earlier 22-year period of 1980-2001, the study finds that the spatial extent of heatwave-led CDHEs rises by 1.6% per 1C of global temperature rise. For the more-recent period of 2022-23, this increases “nearly eightfold” to 13.1%.
The change suggests that the rapid increase in the heatwave-led CDHEs occurred after the global average temperature “surpasse[d] a certain temperature threshold”, the paper says.
This threshold is an absolute global average temperature of 14.3C, the authors estimate (based on an 11-year average), which the world passed around the year 2000.
Investigating the recent surge in heatwave-leading CDHEs further, the researchers find a “regime shift” in land-atmosphere dynamics “toward a persistently intensified state after the late 1990s”.
In other words, the way that drier soils drive higher surface temperatures, and vice versa, is becoming stronger, resulting in more heatwave-led compound events.
Daily data
The research has some advantages over other previous studies, Yeh says. For instance, the new work uses daily estimations of CDHEs, compared to monthly data used in past research. This is “important for capturing the detailed occurrence” of these events, says Yeh.
He adds that another advantage of their study is that it distinguishes the sequence of droughts and heatwaves, which allows them to “better understand the differences” in the characteristics of CDHEs.
Dr Meryem Tanarhte is a climate scientist at the University Hassan II in Morocco, and Dr Ruth Cerezo Mota is a climatologist and a researcher at the National Autonomous University of Mexico. Both scientists, who were not involved in the study, agree that the daily estimations give a clearer picture of how CDHEs are changing.
Cerezo-Mota adds that another major contribution of the study is its global focus. She tells Carbon Brief that in some regions, such as Mexico and Africa, there is a lack of studies on CDHEs:
“Not because the events do not occur, but perhaps because [these regions] do not have all the data or the expertise to do so.”
However, she notes that the reanalysis data used by the study does have limitations with how it represents rainfall in some parts of the world.
Compound impacts
The study notes that if CDHEs continue to intensify – particularly events where heatwaves are the precursors – they could drive declining crop productivity, increased wildfire frequency and severe public health crises.
These impacts could be “much more rapid and severe as global warming continues”, Yeh tells Carbon Brief.
Tanarhte notes that these events can be forecasted up to 10 days ahead in many regions. Furthermore, she says, the strongest impacts can be prevented “through preparedness and adaptation”, including through “water management for agriculture, heatwave mitigation measures and wildfire mitigation”.
The study recommends reassessing current risk management strategies for these compound events. It also suggests incorporating the sequences of drought and heatwaves into compound event analysis frameworks “to enhance climate risk management”.
Cerezo-Mota says that it is clear that the world needs to be prepared for the increased occurrence of these events. She tells Carbon Brief:
“These [risk assessments and strategies] need to be carried out at the local level to understand the complexities of each region.”
The post Heatwaves driving recent ‘surge’ in compound drought and heat extremes appeared first on Carbon Brief.
Heatwaves driving recent ‘surge’ in compound drought and heat extremes








