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
Amazon summit leaves observers ‘frustrated’
MISSING THE TARGET: The fifth summit of the Amazon Cooperation Treaty Organization (ACTO) took place last Friday, with the release of the Bogotá Declaration coming the next day, Agência Brasil reported. The meeting was a “platform to update the commitments of the countries” that share the Amazon rainforest, the outlet said. The declaration “emphasised the urgency of coordinated action against deforestation and biodiversity loss”, but there was an “absence of clearer targets”, which “frustrated” observers and civil-society groups. Agência Brasil also said that the “issue of energy transition and fossil-fuel exploration” was divisive at the summit.
-
Sign up to Carbon Brief’s free “Cropped” email newsletter. A fortnightly digest of food, land and nature news and views. Sent to your inbox every other Wednesday.
INDIGENOUS INCLUSION: Ahead of the meeting, Indigenous groups were “demanding that oil be left underground…[and] that the Amazon be declared the world’s first no-go zone for fossil-fuel exploration and exploitation”, EFE Verde reported. According to Stand.earth, the summit “strengthen[ed] Indigenous participation” despite “fail[ing]” to meet the fossil-fuel demands. The summit resulted in the creation of the Amazonian Indigenous Peoples Mechanism (MAPI), which Stand.earth explained “establishes a co-governance structure” for ACTO where each country is represented by both a government and an Indigenous delegate.
FUND THE FACILITY: Another element of the Bogotá Declaration was a pledge to support the Tropical Forests Forever Facility (TFFF), Climate Home News reported. The outlet added that the declaration “invites” countries to “announce substantial contributions” in order to “guarantee the fund’s quick activation”. Brazil’s president, Luiz Inácio Lula da Silva, said: “We’re fed up with promises…I want to see who’s going to put up the money to keep the forest standing.” Meanwhile, ((o))eco reported that Brazil saw an 84% increase in international climate finance from 2019-20 to 2021-22, but forests received just 2%.
Wildfires continue to burn
NEW EU RECORD: Wildfires have ravaged more than 1m hectares in the EU in 2025, the largest area since records began in 2006, according to an analysis by Agence France-Presse. The news agency analysed data from the European Forest Fire Information System and found that Spain, Cyprus, Germany and Slovakia have been the hardest hit over the past two decades. Additionally, satellites revealed that wildfires across the Iberian peninsula released 13m tonnes of carbon dioxide this year – six times larger than 2022 levels, El Periódico reported.
HARDEST HIT: Six firefighters died while combatting “devastating wildfires exacerbated by an enduring heatwave” in Spain and Portugal, according to France24. More than 343,000 hectares were “ravage[d]” this year in Spain, setting a new national record, the outlet said. Scientists identified the primary cause of the fires in both countries as an “overabundance of flammable vegetation on abandoned land and authorities’ failure to take preventive measures,” which prompted Spain’s environmental prosecutor to initiate an “investigation into the lack of prevention plans”, Politico added.
US FIRES: Wildfires in California and Oregon led to the evacuation of thousands of homes, the Associated Press reported. In Oregon, the fire began Thursday and “grew quickly amid hot, gusty conditions”, the newswire said. A “sweltering” heatwave has hospitalised people in the western US, it added. Mongabay covered the “scientific standoff” surrounding the “active management” of forests, which consists of using controlled burning and thinning of forests to promote regeneration and resilience. It added that forest managers are “grappl[ing] with the growing effects of climate change”.
News and views
PRIVATE SECTOR CALL: Nature loss will reduce UK GDP by 5% without a “greater effort” from the private sector to halt the decline, the Guardian said. A report from the Green Finance Institute and WWF said that companies in many sectors can receive economic returns from investment in nature. The outlet noted that some businesses “are failing to reform or are unaware of the impact of their actions on nature and the climate”. The report listed suggestions for companies to take action on nature decline.
SOLAR SLOWDOWN: The US Department of Agriculture (USDA) announced it will “heighten scrutiny of some solar and wind projects” on farmland across the country, reported Reuters. The agency said it will stop funding larger renewable energy facilities and will not allow the use of foreign-made solar panels. Inside Climate News said the agency had expressed concern about the possible expansion of wind and solar facilities on productive farmland. However, the outlet cited a 2024 USDA analysis finding that renewables occupy 0.05% of the 897m acres of pasture and cropland in the country.
FISHERY REFORM: Ghanaian president John Dramani Mahama signed a “sweeping” fisheries and aquaculture reform act into law last week that the government believes will “ensure sustainability…and better protection for the country’s fishing communities”, according to Ghana Broadcasting Corporation. One provision in the bill is an expansion of the country’s inshore exclusion zone, which prevents industrial trawling ships from encroaching on artisanal fishing grounds. News Ghana reported that the law is “designed to address EU trade sanctions”, which threaten the country’s $425m annual seafood exports.
POLARISED POLICY: A new forest land policy in the Philippines has been touted by officials as a “major shift in forest governance”, but has been questioned by civil society organisations, Mongabay reported. Under the policy, farmers are able to carry out multiple different land uses – including reforestation, ecotourism, conservation and commercial use – in designated forest areas. The secretary of the Philippines’s environment department said the reform is an attempt to “unlock the economic potential” of the country’s forests and scale up sustainable investment. The outlet said that environmental groups warned of the policy resulting in forest degradation, the displacement of Indigenous peoples and greenwashing.
PARAGUAYAN PLANTATIONS: Apple purchased carbon credits associated with the use of agrochemicals harmful to communities on eucalyptus plantations in Paraguay, a joint investigation for Consenso and Climate Tracker revealed. The investigation used documents, field visits and satellite images to show that the forestry company selling these carbon credits does not “comply with agrochemical regulations”. It added that eucalyptus monocultures cover more than 300,000 hectares in Paraguay. Residents have pointed out the risks of wildfire due to “persistent drought” conditions in the country over the past five years. Apple had not responded to the allegations at the time of the investigation’s publication.
Spotlight
Extreme heat could triple lost work hours by century’s end
This week, Carbon Brief covers a new UN-backed report that examines the impacts of climate change on labour productivity and health.
Manual labourers, such as farmworkers and fisherfolk, are “already” being impacted by rising temperatures, according to two UN agencies.
A new report from the World Meteorological Organization (WMO) and the World Health Organization (WHO) examined the effects of climate change on heat stress in the workplace and offered technical guidance for employers, workers and policymakers.
The report called occupational heat stress a “global societal challenge”.
It also noted that both the direct and indirect impacts of environmental heat stress will worsen and spread geographically as the world continues to warm.
In a press conference prior to the release of the report, Dr Rüdiger Krech, interim director of the WHO’s environment, climate change and migration programme, said the report offered the “most comprehensive evidence yet on how rising temperatures are harming workers”.
‘Adverse consequences’
In 1969, the WHO published a technical report on the potential health threats of working under environmental heat stress. The report concluded that “knowledge relating to occupational heat exposures is inadequate in many respects”. It recommended several priorities for further research.
The new report updated the 1969 report with decades’ worth of research showing that workplace heat stress “directly threatens workers’ ability to live healthy and productive lives and leads subsequently to worsening poverty and socioeconomic inequality”.
It found that around half of the global population currently experiences “adverse consequences of high environmental temperatures”. Agricultural work is “often regarded as [one of] the highest-risk occupations” for work-related heat illness, it said.
Farmworkers typically work with little or no shade during the hottest hours of the day. Some groups of agricultural workers – such as those who manually spray pesticides or other agrochemicals – face added risk of heat stress due to the protective gear that they must wear.
The report warned that, while several early warning systems are in place to protect people during heatwaves, these systems may not be adequate to protect workers, who differ in their exposure to heat and their ability to adapt.
Raising the risk
The new report also examined the changing risks of occupational heat exposure in the context of climate change.
Citing the work of the Intergovernmental Panel on Climate Change, it noted that each additional 0.5C of warming “significantly raises the risk of longer and more severe heatwaves”. The largest relative shifts will take place in the temperate mid-latitudes, but the frequency of dangerous events will also increase in the tropics, which have the “greatest workplace heat stress problems at present”.
Under the emissions scenario that aligns with current national climate policies, the worst-affected countries will face annual work hour losses of up to 11% by the end of the century – up from 2-4% today, the report said.
Previous research has found that 3C of warming could reduce global labour capacity by up to 50%, driving up food prices and requiring higher levels of agricultural employment to make up the shortfall.
Krech told the press conference:
“Protecting workers from extreme heat is not only a health priority, it is essential to building resilient, equal and sustainable societies in a warming world.”
Watch, read, listen
ACCESS ISSUES: Civil Eats covered a group in northern California that works to bridge the gap between emergency-relief organisations and local food-systems workers during emergencies.
DELVING INTO THE DEPTHS: NPR Shortwave addressed the importance of mapping the entire seafloor for “improving human life”, from tsunami alerts through to renewable energy.
CONSEQUENCES IN CALIFORNIA: A California state legislator and the president of the California Farm Bureau wrote in the New York Times how immigration raids on farmworkers increase food waste and drive up prices.
‘MESSY GARDENS’: A CBC News video explored how having a “messy garden” can bring benefits for biodiversity and contribute to mitigating climate change.
New science
- A study published in One Earth found that the “planetary boundary” of ecosystem integrity may have already been breached on up to 60% of the Earth’s land surface. Researchers modelled ecological disruption and found that 38% of the Earth is “already at high risk of degradation”.
- Research in the Proceedings of the National Academy of Sciences found that if global temperatures rise 2.3C above pre-industrial temperatures, soil bacterial and fungal diversity would be reduced by 16 and 19%, respectively. It also found that soil organic carbon would drop by 18% under that level of warming.
- Eating a diet of biodiverse, plant-based foods can have “modest benefits” for both sufficient nutrition and environmental health, according to new research published in Nature Food. The study found that diversity of animal-sourced foods was inversely associated with both greenhouse gas emissions and land use.
In the diary
- 18-29 August: Second session of the preparatory commission for the Agreement on Marine Biological Diversity of Areas beyond National Jurisdiction | New York
- 31 August-5 September: Africa Food Systems Summit | Dakar, Senegal
- 2-5 September: Subregional dialogue on biodiversity monitoring and reporting | Bangkok, Thailand
- 14-18 September: International Mountain Conference | Innsbruck, Austria
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 27 August 2025: ‘Frustrating’ Amazon summit; Workplace heat hazards; Record European wildfires 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 instability”, according to the Daily Telegraph.
China’s climate plan
PEAK COAL?: China has set out its next “five-year plan” at the annual “two sessions” meeting of the National People’s Congress, including its climate strategy out to 2030, according to the Hong Kong-based South China Morning Post. The plan called for China to cut its carbon emissions per unit of gross domestic product (GDP) by 17% from 2026 to 2030, which “may allow for continued increase in emissions given the rate of GDP growth”, reported Reuters. The newswire added that the plan also had targets to reach peak coal in the next five years and replace 30m tonnes per ye