Welcome to Carbon Brief’s DeBriefed.
An essential guide to the week’s key developments relating to climate change.
This week
Earth eyes 2C
TEMPERATURE WARMING: Global temperatures could hit nearly 2C above pre-industrial levels for the first time in the next five years, according to new data from the UN World Meteorological Organization (WMO) covered by the Financial Times. The outlet noted that this would not represent a breach of the Paris Agreement target of keeping warming below 2C, as this threshold is typically measured over at least two decades. However, it added that 2C of warming would result in a “fall in crop yields” and more than a third of the world’s population being exposed to extreme heat.
WILDFIRE EMERGENCY: Wildfires in Canada have forced thousands of people to flee their homes, CBC News reported. The government of Manitoba declared a state of emergency after evacuating 17,000 people and neighbouring province Saskatchewan followed suit a day later, CBC News said. Manitoba premier Wab Kinew said the prevalence of fire in “every region” was a “sign of a changing climate that we are going to have to adapt to”, according to Le Monde. BBC News noted that “scientists have linked worsening wildfire seasons to climate change”.
MONSOON IN MAY: Monsoon rains hit the coast of India’s southernmost state of Kerala eight days early, marking the earliest arrival of the rainy season in 16 years, Reuters reported. Just two days later, the rains reached Mumbai – the city’s earliest monsoon in 75 years, according to Business Standard. India Today said human-caused climate change and “natural climatic systems” played a role.
ALPINE DISASTER: A landslide of ice, mud and rocks triggered by the collapse of a glacier has buried a large part of the Swiss village of Blatten, Swissinfo reported. Climate scientist Christian Huggel told Reuters that climate change had “likely played a part in the deluge”, given that the loss of permafrost can “negatively affect the stability of mountain rock”. The Swiss army has been deployed to find a missing person, Reuters said.
Around the world
- INDONESIA UN-QUITS COAL: Indonesia set out plans to build new coal plants in its power supply plan for 2025-2034, “backtrack[ing]” on its previous pledge to gradually phase out coal assets, the Straits Times said.
- NIXED: Inside Climate News covered analysis which found that $14bn of clean energy investment has been cancelled so far this year in the US. The non-profit group behind the figures – Environmental Entrepreneurs – said this was an “ominous sign” as the Senate gears up to vote on a bill that would, if passed in its current form, gut Biden-era clean energy tax credits.
- ‘CLIMATE SETBACK’: Bloomberg reported that Australia has given preliminary approval to extend the life of its biggest and oldest liquefied natural gas (LNG) plant from 2030 to 2070.
- THE NEW SCEPTICS: COP30 president-designate André Corrêa do Lago told the Guardian that attempts to discredit climate policies are the “new kind of opposition to climate action”. He said: “It’s not a scientific denial, it’s an economic denial.”
- FARAGE’S ‘FANTASY’: Meanwhile, the UK’s hard-right Reform party led by Nigel Farage has been accused of espousing “fantasy economics” after falsely claiming £225bn could be saved by scrapping net-zero projects, according to the Evening Standard.
- GREEN TOURIST LEVY: Hawaii has introduced a tax on hotel rooms and holiday rentals which will raise money for environmental protection and defences against natural disasters, the Guardian reported.
18 football pitches
The equivalent amount of primary tropical forest that was lost every minute in 2024, according to data from the World Resources Institute.
Latest climate research
- Researchers in Nature Climate Change looked at how floods drove migration between counties in the US from 2006-19, finding young, educated people were more likely to leave following a disaster, while older, unemployed people were more likely to move into an affected area.
- Sea ice strength and “pressure” along two major Arctic shipping routes will decline “substantially” over the next two decades under strong warming, according to findings in Geophysical Research Letters.
- A study in Nature revealed that changes to concentrations of air pollutants have contributed in recent decades to an increase in the global “methane sink”, the amount of methane that is removed from the atmosphere and thus unable to drive up temperatures.
(For more, see Carbon Brief’s in-depth daily summaries of the top climate news stories on Tuesday, Wednesday, Thursday and Friday.)
Captured
A new analysis by Carbon Brief of data from UK energy regulator Ofgem showed how the biggest driver of recent increases in electricity bills in the UK has been wholesale electricity prices – which in the UK are set almost exclusively by wholesale gas prices. In contrast, “green levies” – costs added to bills in order to pay for government climate policies – actually fell during the height of the gas price spike, as the dark grey area of the chart shows. This runs counter to opposition politicians’ claims that the UK’s high electricity prices are caused by its target for net-zero emissions by 2050 and green levies.
Spotlight
Livestreaming for climate science
This week, Carbon Brief speaks to US climate scientists taking part in a 100-hour livestream aimed at raising awareness of their work and the risks they face.
Marathon livestreams are typically the preserve of video gamers, sex workers and chess stars – not climate scientists. But unusual times call for unusual measures.
Hundreds of climate scientists and meteorologists from across the US are this week participating in a 100-hour livestream, which aims to raise awareness of their work as the government gears up for a major programme of cuts to federal science agencies.
The broadcast runs day and night until Sunday afternoon on YouTube, with each speaker advised to dedicate their 30-45 minute session to presenting their research in layperson’s terms – with a mention of how it is or could be impacted by federal cuts to science.
The online event comes after the Trump administration set out plans to halve NASA’s science budget and shrink the National Oceanic and Atmospheric Administration (NOAA’s) funding by more than a quarter.
The livestream will be rolling while NASA’s climate and space monitoring lab, the Goddard Institute for Space Studies, is moving out of its New York building on 31 May, after the federal government abruptly terminated the space agency’s lease.
(The White House has also cancelled funding to the body that produces the country’s National Climate Assessment, blocked US scientists from attending Intergovernmental Panel for Climate Change meetings and laid off hundreds of workers at the agency responsible for hurricane preparations.)
Speaking to Carbon Brief in a personal capacity, climate scientist and keynote speaker Dr Kate Marvel described the livestream event as a “fire hose of public engagement”. She added:
“It is scientists making the case to the people we work for. We work for the American people because we receive taxpayer dollars. It is really important for us to share our results, to explain to people why what we do is important and to help them see themselves in what we do.”
‘Climate science affects us all’
At 1:30am California time – 4:30am New York time – on Thursday morning, more than 750 people were tuned in to the livestream, and the comment section was lively.
Some viewers shared words of encouragement – “not from the continent of America but still here to support!!! climate science affects us all!!!!” and “beautiful visualisations!”
Others focused on the science: “Look up the relationship between the Salton Sea and earthquakes – fascinating findings”, “does this mean misaligned storms have two different impacts on each level?” and “albedo effect [fire emoji]”.
Livestream organiser Dr Margaret Duffy, who studies cloud dynamics at the Massachusetts Institute of Technology, said the event’s “long format” is designed to underscore the “widespread” nature of the cuts. She told Carbon Brief:
“[It will] make clear that it’s not one or two programmes that are being cut, [nor] one or two researchers that are losing their funding. Researcher after researcher after researcher will explain what they do, and then make the connection to the cuts and what is happening to them.”
The audience is being pointed to materials to help them contact their political representatives about cuts to climate and weather research – but this is not an obligation, Duffy said, explaining that “at a very basic level, we just want to share with the public what it is that we do”.
Climate scientist Marvel commended the livestream organisers for “stepping up” amid much-justified “flailing” and “panic”, adding:
“We are not in normal times. There is a lot of fear and there’s a lot of reasons to be afraid. I think trouble may be coming for us – but we just need to make sure that we get in good trouble. [In other words] you shake things up, you maybe attract negative attention. Maybe it’s scary and maybe there are consequences. But ultimately, you are always going to be happy to have done the right thing.”
Watch, read, listen
WATER CRISIS: Atmos Earth looked at how changing rainfall patterns are impacting the lives of Palestinians already denied access to water.
FRAGILE TEXTS: In a photo essay, Al Jazeera looked at how encroaching desert sands are threatening centuries-old manuscripts stored in Oualata, Mauritania.
LURCHING RIGHT: For Drilled, Amy Westervelt unpacked the structural issues in the US media hurting climate coverage.
Coming up
- 1 June: Round two of Poland’s presidential election
- 2-4 June: 8th Copernicus Climate Change Service general assembly, Valencia, Spain
- 4-7 June:Right here, right now global climate summit, Oxford, UK
Pick of the jobs
- Carbon Brief, summer internship | Salary: London living wage (£13.85 an hour). Location: London (hybrid)
- British Antarctic Survey, space weather scientist | Salary: £41,344-£45,479. Location: Cambridge, UK
- UN Development Programme,energy finance specialist | Salary: Unknown. Location: Abidjan, Cote d’Ivoire
DeBriefed is edited by Daisy Dunne. Please send any tips or feedback to debriefed@carbonbrief.org.
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The post DeBriefed 30 May 2025: Earth eyes 2C; Why net-zero is not behind UK bill hikes; US academics stage climate science ‘fire hose’ appeared first on Carbon Brief.
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
Greenhouse Gases
DeBriefed 6 March 2026: Iran energy crisis | China climate plan | Bristol’s ‘pioneering’ wind turbine
Welcome to Carbon Brief’s DeBriefed.
An essential guide to the week’s key developments relating to climate change.
This week
Energy crisis
ENERGY SPIKE: US-Israeli attacks on Iran and subsequent counterattacks across the Middle East have sent energy prices “soaring”, according to Reuters. The newswire reported that the region “accounts for just under a third of global oil production and almost a fifth of gas”. The Guardian noted that shipping traffic through the strait of Hormuz, which normally ferries 20% of the world’s oil, “all but ground to a halt”. The Financial Times reported that attacks by Iran on Middle East energy facilities – notably in Qatar – triggered the “biggest rise in gas prices since Russia’s full-scale invasion of Ukraine”.
‘RISK’ AND ‘BENEFITS’: Bloomberg reported on increases in diesel prices in Europe and the US, speculating that rising fuel costs could be “a risk for president Donald Trump”. US gas producers are “poised to benefit from the big disruption in global supply”, according to CNBC. Indian government sources told the Economic Times that Russia is prepared to “fulfil India’s energy demands”. China Daily quoted experts who said “China’s energy security remains fundamentally unshaken”, thanks to “emergency stockpiles and a wide array of import channels”.
‘ESSENTIAL’ RENEWABLES: Energy analysts said governments should cut their fossil-fuel reliance by investing in renewables, “rather than just seeking non-Gulf oil and gas suppliers”, reported Climate Home News. This message was echoed by UK business secretary Peter Kyle, who said “doubling down on renewables” was “essential” amid “regional instabilit