Welcome to Carbon Brief’s Cropped.
We handpick and explain the most important stories at the intersection of climate, land, food and nature over the past fortnight.
This is an online version of Carbon Brief’s fortnightly Cropped email newsletter. Subscribe for free here.
Key developments
LA up in flames
ANIMAL IMPACT: At least 25 people died in blazing wildfires that tore through 40,000 acres of land in Los Angeles, NBC News reported. Vox examined how the fires “affected the animals and wildlife who call Los Angeles their home”. Videos showed people evacuating with everything from chickens to horses, Vox said, and one animal shelter took in more than 300 animals. Gavin Jones, an ecologist at the US Forest Service, told the outlet in 2023: “In this new era of rapidly changing fire regimes, we don’t have a great roadmap for how to conserve wildlife.” Al Jazeera explained that wildfires can result in “some wildlife [losing] their habitat”, which can lead to ecosystem imbalance.
AGRI AFFECTED: The fires affected farm infrastructure and animals in the surrounding region, an agricultural meteorologist told RFD TV. A citrus and avocado farm in Pauma Valley, more than two hours from Los Angeles, was impacted by the fire-fuelling Santa Ana winds. Farmer Andy Lyall told ABC News that gusts blew down fruit from his trees, ruining around half of his crops. The “strong and gusty” Santa Ana winds occur several times a year in southern California, BBC News outlined, creating “ripe conditions” for wildfires. (See Carbon Brief’s article on the role of climate change in the fires.)
PARKS AND TREES: Satellite images published in Al Jazeera showed how houses, trees and other infrastructure were scorched in the fires. The Palisades fire – the largest of the fires – “destroyed” historic buildings and other infrastructure at two major parks, according to a statement from California State Parks. Meanwhile, the Los Angeles Times looked at claims and counter-claims about the risk shrubs and brush posed to the spread of the wildfires. Chief Brian Fennessy from the Orange County Fire Authority told the newspaper that clearing brush is “very effective” at limiting fire spread on a normal day, but not against the strength of these fires and winds.
Brazil: COP30, Amazon shipping and soy moratorium
ROCKY WATERS: Brazil’s government cancelled a bid for a “dredging project” to aid the docking of cruise ships in Belém when it hosts COP30 later this year, according to Folha de São Paulo. The dredging, which would remove sediment from the bottom of the port, was expected to impact “the composition of sediments, the behaviour of aquatic mammals and the quality of the water itself”, the newspaper said. The project was aimed to increase accommodation amid a shortage of hotel rooms for the climate summit.
‘RISKY’ SHIPPING PLANS: Meanwhile, Mongabay looked at Brazil’s plans to develop new shipping channels in Amazon waterways, which experts say could “result in conversion of traditional peoples’ lands to carbon-intensive agriculture”. The outlet said the country is “poised” to invest in developing more than 2,000km of channels for agribusiness transport in “shrinking rivers”. Dr José Marengo, a climatologist and hydrology specialist, said it is “crazy” to consider creating the shipping channels in certain rivers because of the “extremely low [water] levels, mainly due to the droughts of 2023 and 2024. It’s very risky.”
SOY PACT: Elsewhere in Brazil, the supreme court will soon rule on a request challenging a state law that would end tax breaks for grain traders who avoid soy from recently deforested areas of the Amazon, Reuters reported. The legislation was passed in Mato Grosso last year, but will not take effect until a final court decision in February, the newswire said. The law added “growing pressure” to Brazil’s soy moratorium – the “voluntary pact” to ban the purchase of soy from deforested Amazon areas after 2008, Reuters noted. Last month, a farmer lobby group asked the country’s antitrust agency to investigate the signatories of this pact, describing them as a “purchasing cartel”, the newswire said.
Spotlight
Illegal rewilding in Scotland
In this Spotlight, Carbon Brief explores the curious case of the illegal reintroduction of four Eurasian lynx in the Scottish Highlands.
A few days ago, a pair of labrador-sized cats with dappled fur and tufty ears were spotted wandering free in Cairngorms national park in the Scottish Highlands.
They were quickly identified as Eurasian lynx, a species of big cat that went extinct in the UK more than 1,000 years ago. (They are still widely found across Europe and Asia).
The cats were released illegally, according to the police and the national park authority. The animals – along with a second pair caught on camera traps a day later – were captured humanely and brought to a nearby wildlife park. One has since died.
While there is a growing movement advocating for the reintroduction of lynx in order to “rewild” Scotland, none of the conservation groups involved with such calls have claimed responsibility for the release.
One charity called the move “reckless” and “highly irresponsible”, warning the cats were most likely raised in captivity and would have died after being left alone in the wild.
Despite this, there is “speculation” that the most likely culprit is “someone who had grown frustrated with the slow progress” of the campaign to reintroduce lynx to Scotland and decided to “take matters into their own hands”, according to the Guardian.
Guerrilla rewilding
The UK has a long history of illegal animal releases shaping its ecosystems.
Multiple introductions of grey squirrels since the 1890s has all but wiped out the native red across most of the country. Further illicit releases, once blamed on the US musician Jimi Hendrix, have allowed feral green parakeets to spread across London and its surrounding areas.
More recently, conservationists have warned of the growing practice of “beaver bombing”, the covert release of beavers into natural areas by advocates who think the government is not moving fast enough to reintroduce the rodents as part of rewilding efforts. (The new Labour government is reportedly blocking plans to legalise beaver releases in England.)
Both beavers and lynx are considered to be “keystone species”, meaning they can have an outsized impact on the environment surrounding them.
A group of beavers released illegally in the River Otter in Devon were given official permission to stay by the government after a five-year trial showed that their dam-building helped to alleviate flood risk and local pollution.
Climate carnivores
Advocates of reintroducing lynx to Scotland say that the predators could help to reshape the forest ecosystem surrounding them through the “ecology of fear”.
In essence, lynx litter the landscape with their faeces and urine, prompting roe deer – their main prey – to keep moving, rather than staying still and overgrazing on young vegetation before it has had a chance to establish.
Over time, this could help to create a denser forest environment, with benefits for storing carbon and boosting biodiversity, it is argued.
However, research has found that local communities in Scotland have mixed feelings about reintroducing lynx.
A study published in 2023 involving interviews with more than 40 people found that some locals were in favour of reintroducing lynx, either for economic or environmental reasons, while others were “unconvinced” of the evidence supporting the benefits or felt strongly opposed to the idea of big cats being set loose.
The farmers’ union NFU Scotland opposes the reintroduction of lynx over fears the animals could hunt and kill livestock.
News and views
BIDEN BACKTRACKS: The Biden administration “abruptly” stepped back from a plan to protect old-growth forests after “pushback from Republicans and the timber industry”, the Associated Press reported. This ended a “years-long process to…better protect old trees that are increasingly threatened by climate change”, the newswire said. Opponents argued that restricting logging in older forests was not necessary, partly because “many forested areas already are protected”, the AP said. Alex Craven from the Sierra Club conservation group said there was a “scientific necessity and public expectation” to protect these forests.
WATER WOES: Climate change is “wreaking havoc” on the Earth’s water cycle, according to the Global Water Monitor’s 2024 report, covered by the Indian Express. Last year, water-related disasters killed at least 8,700 people, displaced 40 million and resulted in economic losses exceeding $550bn globally, the newspaper said. At the same time, there were 38% more record-dry months, compared to the period 1995-2005. In 2025, droughts could intensify in northern South America, southern Africa and parts of Asia, it added.
KOALAS AT RISK: Logging in the proposed “Great Koala national park” in New South Wales, Australia, has increased since 2023, according to an analysis covered by the Guardian. In March 2023, a new Labor state government came into power, promising to protect the area. But the report, from the conservation group North East Forest Alliance, found that more than 7,000 hectares of forest has been logged in the region since then, the newspaper said. New South Wales agriculture minister Tara Moriarty said “the claims in the report are not true” and the government was “getting on with delivering a Great Koala national park while at the same time ensuring a sustainable timber industry”.
BOTSWANA ADAPTATION: Botswana has put forward a new climate plan to the UN, prioritisting adaptation measures, such as introducing drought-tolerant crops and cows, over measures to cut its already-low emissions, Climate Home News reported. Botswana’s climate plan, known as a “nationally determined contribution” (NDC), said that, “as Botswana is one of the lowest emitters in the world, the limited financial resources available will be prioritised for adaptation”. Climate Home News said that the move has been “praised by African climate negotiators as a model that low-emitting, vulnerable countries should follow”.
FUTURE CROP YIELDS: Senior officials in India believe that rice and wheat yields will drop by 6-10% in future due to climate change, the Press Trust of India reported, via the Kashmir Observer. This will “significantly impac[t] farmers and food security”, Mrutyunjay Mohapatra, the director general of the India Meteorological Department, told the newspaper. In 2023-24, India’s wheat output exceeded 113m tonnes – about 14% of the global output, the outlet noted. The country also produced more than 137m tonnes of rice.
Watch, read, listen
BACK IN TIME: The possibilities and scientific developments around species “de-extinction” were discussed in a Yale Environment 360 feature.
ON THE MOVE: An article in Vox explored how wildlife migrations are “increasingly threatened” by roads, climate-fuelled extreme weather and agricultural fields.
DAILY FIX: An editorial in the Financial Times examined how climate change is “mostly to blame” for skyrocketing coffee and chocolate prices.
‘UNIT OF NATURE’: In the first Georgina Mace Review, an annual conservation biology journal named after the late UK scientist, a group of biologists examine whether it is possible to create a standardised measure for biodiversity, otherwise known as a “unit of nature”.
New science
- A Nature study found that one-quarter of freshwater animal species are at “high risk” of extinction. The researchers assessed the global extinction risk of more than 23,000 freshwater species, finding that fauna faced several “prevalent threats”, such as pollutants, agriculture and invasive species.
- Crop and grass biomass production could decline by more than 50% by 2050 in parts of west Africa due to climate change and other factors, a study in Scientific Reports said. The results of the modelling “underscore the intricate interplay between climate, crops, livestock and emissions”, the researchers wrote.
- Forests in Borneo that had been selectively logged retained relatively high levels of biodiversity, compared to areas that had been cleared to make way for palm oil plantations, research in Science found. The findings “demonstrate the complexity of land-use impacts on ecosystems”, the study said.
In the diary
- 15-18 January: Global Forum for Food and Agriculture | Berlin
- 16 January: Vanuatu parliamentary elections
- 16-17 January: G20 first sustainable finance working group meeting | South Africa
- 20 January: US presidential inauguration day | Washington DC
- 20-24 January: World Economic Forum annual meeting | Davos, Switzerland
Cropped is researched and written by Dr Giuliana Viglione, Aruna Chandrasekhar, Daisy Dunne, Orla Dwyer and Yanine Quiroz. Please send tips and feedback to cropped@carbonbrief.org
The post Cropped 15 January 2025: LA up in flames; Illegal rewilding in Scotland; COP30 dredging cancelled appeared first on Carbon Brief.
Cropped 15 January 2025: LA up in flames; Illegal rewilding in Scotland; COP30 dredging cancelled
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 s