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.
Key developments
G7 eyes food progress
ITALY MEETING: The Group of Seven (G7) nations met in Italy last week to discuss a range of issues spanning war and hunger to climate change and energy. The summit saw the seven major economies launch a new initiative for tackling hunger, Reuters reported. Known as the G7 Apulia Food Systems Initiative (AFSI) – named after the Southern Italian region where the summit took place – the proposal aims to “overcome structural barriers to food security and nutrition”, according to a declaration published after the event. According to the newswire, the initiative will focus on low-income countries and support projects in Africa, “one of the top priorities under Italy’s rotating G7 presidency this year”. It added that details of the scheme will be agreed by G7 development ministers in the coming months.
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AFRICA LEFT OUT: Despite having a focus on Africa, agricultural leaders from the continent told Reuters they were not consulted about the new scheme. Ibrahima Coulibaly, president of the West African Network of Peasants and Agricultural Producers, told the newswire: “It is missing family farmers organisations that have not been involved even though small-scale producers will be key to its success.” In African Arguments, Madagascar’s agricultural minister Suzelin Rakotoarisolo Ratohiarijaona was also critical of the lack of involvement of African smallholder farmers in the new scheme, saying: “It’s telling that the Apulia Initiative was developed without their input. If this doesn’t change, it can’t hope to understand or address the daily challenges they face.” He added that the scheme must channel new finance towards grassroots groups and “encourage a shift to more diverse and nature-friendly forms of agriculture”.
‘ZERO’ HARVESTS: The new initiative came as the chief officer of the World Food Programme told BBC News that parts of Africa, as well as the Middle East and Latin America, are now unable to sustain crops due to constant floods and droughts, leaving people completely reliant on humanitarian aid. WFP director Martin Frick told the broadcaster that some of the poorest regions had now reached a tipping point of having “zero” harvests left, as “extreme weather was pushing already degraded land beyond use”. In the east African nation of Burundi, months of heavy rain and flooding has left 10% of all farmland unusable, Frick told BBC News. In the Darfur region of Sudan, cereal crop yields are 78% below the average for the previous five-year average amid drought and civil war, he added.
Food price spikes continue
MULTIPLE CROPS AND CAUSES: Consumers have recently experienced sustained increases in the prices of a range of foods. These price spikes have been attributed to various factors, ranging from climate change and harmful agricultural practices to the international economy and geopolitical tensions. Carbon Brief has just published an article that gathers the views of experts in the agrifood sector on the major causes of this global problem that is already putting pressure on producers, intermediaries and consumers.
CLIMATE-RELATED IMPACTS: Extreme weather events and diseases are hampering harvests and driving up orange prices in Brazil and Florida, Axios reported. The outlet added that in Florida, citrus production has declined 3% on average annually since 2003 and that, according to the International Monetary Fund, the price of oranges globally rose from $2.76 in 2023 to $3.68 in April this year. Prof Andy Challinor, professor of climate impacts at the University of Leeds, told Carbon Brief that “climate change is beginning to outpace us because it is interacting with our complex interrelated economic and food systems”.
CONFLICT REPERCUSSIONS: Dr Rob Vos, director for markets, trade and institutions at the International Food Policy Research Institute, told Carbon Brief that the highest inflation rates have been seen in countries with food systems “disrupted by intensified conflict”, such as Ethiopia, Gaza, Haiti and Sudan. He added that countries with macroeconomic constraints and weak currencies, such as Argentina, Venezuela and Turkey, are also particularly hard-hit. Bloomberg reported that access to agricultural land and workforce reduction due to the war in Gaza has caused Israel’s 29 largest food companies to increase their prices by as much as 30% since January.
UNSUSTAINABLE FARMING: Levi Sucre, coordinator of the Mesoamerican Alliance of Peoples and Forests, told Carbon Brief that overexploitation of land and the use of agrochemicals have increased the demand for fertilisers and the costs of production. For instance, Dr Innocent Okuku, executive secretary of the West African Fertiliser Association, told the Nigerian newspaper Daily Trust that application of fertilisers by smallholder farmers “is getting lower because of the issues around availability and cost”. The most affected are “people with the least resources”, says Sucre. Amongst those “highly vulnerable to food insecurity” are small island developing states, given that less than 1% of their land is devoted to agriculture, 70% of them face the risk of water scarcity and all have lost almost 7% of their agricultural GDP to climate-related disasters, Forbes reported.
Spotlight
Progress on agrifood systems at Bonn
In this spotlight, Carbon Brief explores the progress made regarding agriculture and food security at the recent Bonn climate talks.
The UN Framework Convention on Climate Change (UNFCCC) formally addresses issues and works towards solutions in agriculture and food systems through the Sharm el-Sheikh joint work on implementation of climate action on agriculture and food security (SSJW).
When SSJW negotiations ended at COP28 in Dubai, several experts told Carbon Brief that those outcomes had been disastrous, with the only tangible result of the summit being an “informal note”, which “essentially means, ‘we talked, we’ll talk again’”, Teresa Anderson, global climate justice lead at ActionAid, told Carbon Brief at the time.
The major sticking points at COP28 were the subject matter of a series of workshops to be held under the SSJW umbrella and the creation of a “coordination group” to oversee the implementation of the recommendations from those workshops.
‘Surprisingly sensible’
In contrast to COP28, this round of negotiations at Bonn were “surprisingly sensible”, Anderson said. Marie Cosquer, an advocacy analyst at Action Against Hunger, told Carbon Brief that “the vibe was nothing like Dubai” and the “parties started to engage constructively from the beginning”.
To begin with, Cosquer said, a “non-paper” with proposals, circulated by the EU negotiators ahead of the negotiations, allowed parties to react and “slowly became a way forward for consensus”. In addition, the G77 plus China negotiating group – who had advocated strenuously for the coordination group in Dubai – took a less hardline stance on the creation of the group.
The negotiators ultimately agreed upon two workshop topics: one on “systemic and holistic approaches to implementation of climate action on agriculture, food systems and food security” and the other on “progress, challenges and opportunities related to identifying needs and accessing means of implementation for climate action in agriculture and food security”.
Roadmap
The draft conclusions from Bonn also provide a roadmap for the remainder of the SSJW’s mandate, which runs to COP31 in November 2026. It lays out that the online portal, where parties will be able to upload their submissions for each workshop, should be developed over the next five months and presented at COP29 in November.
Clement Metivier, acting head of international advocacy at WWF-UK, said the roadmap was an “important and positive breakthrough”. It represented a “prime opportunity for governments to prioritise systemic and holistic approaches to transforming our food systems and make them healthy, resilient and equitable”, he added:
“There is no time to waste.”
News and views
EU RESTORATION LAW: EU ministers have approved the bloc’s nature restoration law, “despite stiff opposition to the plans and threats by Austria that it would seek to annul the outcome of the vote”, the Financial Times reported. The FT said “last-minute changes of heart from Austria and Slovakia” allowed the law to pass. However, the vote from Austria came from climate minister Leonore Gewessler, a Green party politician, who did not obtain approval from her coalition government partner, the conservative Austrian People’s Party, the FT said. In a letter to Belgium, which is currently holding the EU presidency, Austria’s chancellor Karl Nehammer, from the People’s Party, said Austria’s vote was “unlawful” and that his party would seek criminal charges against Gewessler for “alleged abuse of power”, the FT added.
FLOODS AND FOOD: Flooding in southern Brazil that started last month has caused $2.2bn in damages, including $680m in agricultural losses, according to Brazil Reports. The outlet added that “agribusiness is by far the most affected economic sector”, citing a study that found that the floods could cut agricultural GDP by up to 3.5%. Meanwhile, extreme weather in China is “raising concerns about food security” there, CNN reported. High temperatures and severe drought are impacting the northern part of the country while “heavy rains inundate the south”, the outlet said. It noted that the spring and summer planting seasons have been disrupted in key rice- and wheat-producing regions.
COTTON CROPS: High temperatures are “threatening cotton production” in the world’s fifth-largest cotton producer, Pakistan, Bloomberg reported. Nearly 10% of the total crop in Sindh – “one of the country’s most fertile provinces” – has been damaged by heat already, the outlet added, and “the situation is poised to get worse”. According to the country’s meteorological department, the month of June will bring rapid-onset “flash” drought, which can result in water shortages, wildfire and crop failure. Bloomberg added: “Besides cotton, excessive heat is also affecting sugarcane, exportable fruits like mangoes, citrus, banana and seasonal vegetables like chillies, tomato, potato and some lentils.”
ALGERIA RIOTS: The Associated Press reported that “violent riots erupted in a drought-stricken Algerian desert city last weekend after months of water shortages left taps running dry and forced residents to queue to access water for their households”. In the central Algerian city of Tiaret, “protestors wearing balaclavas set tires aflame and set up make-shift barricades blocking roads to protest their water being rationed”, AP said. It continued: “The unrest followed demands from President Abdelmajid Tebboune to rectify the suffering. At a council of ministers meeting last week, he implored his cabinet to implement ‘emergency measures’ in Tiaret. Several government ministers were later sent to ‘ask for an apology from the population’ and to promise that access to drinking water would be restored.”
Watch, read, listen
MOSQUITOES TO THE RESCUE: NPR reported on how scientists are transporting hundreds of thousands of mosquitoes to Hawaii to try to save their native bird species.
DEEP DIVE: On Last Week Tonight, comedian John Oliver dived into the controversy surrounding deep-sea mining. (Note, unfortunately, this is not available to watch in the UK.)
ANCESTRAL FORESTS: Nautilus chronicled an expedition to Hoh Rainforest in Washington state, “one of the largest old-growth temperate rainforests in the world”.
AFFECTED FISHERMEN: A multimedia story by InfoNile explored the impacts of overexploitation and illegal taxes by militias on fish production in Africa’s Lake Edward.
New science
Communications Earth & Environment
The increasing number of days without sea ice in southern and western Hudson Bay, an inland marginal sea of the Arctic Ocean in Canada, could make the loss of polar bears from this region “inevitable”, even if efforts are pursued to limit future climate change, new research found. The study drew on the latest high-resolution climate models to project the length of the ice-free period in Hudson Bay. The authors said: “Limiting global warming to 2C above pre-industrial levels may prevent the ice-free period from exceeding 183 days…providing some optimism for adult polar bear survival. However, with longer ice-free periods already substantially impacting recruitment, extirpation for polar bears in this region may already be inevitable.”
Intensified future heat extremes linked with increasing ecosystem water limitation
Earth System Dynamics
According to a new study, increasing water stress in land ecosystems will likely amplify the effects of extreme heat on people and wildlife globally. The researchers explained that while heat extremes “are mostly introduced by atmospheric circulation patterns”, they can be mitigated by ecosystems, which can provide a natural cooling service through plant transpiration and soil evaporation when there are ample water supplies. However, when water supplies in ecosystems are limited, heat extremes can be amplified, the new research found. The authors said: “We identify hotspot regions in tropical South America and across Canada and northern Eurasia where relatively strong trends towards increased ecosystem water limitation jointly occur with amplifying heat extremes.”
Early-stage loss of ecological integrity drives the risk of zoonotic disease emergence
Journal of the Royal Society Interface
The emergence of new diseases from animals – known as “zoonotic diseases” – is “strongly linked” to human pressures on biodiversity, new research suggested. The study updated the most comprehensive zoonotic emerging infectious disease event database with the latest reported events to analyse the relationship between new outbreaks and human pressures on ecosystems. The authors said: “We found emerging infectious disease risk was strongly predicted by structural integrity metrics such as human footprint and ecoregion intactness, in addition to environmental variables such as tropical rainforest density and mammal species richness.” Emerging infectious disease events “were more likely to occur in areas with intermediate levels of compositional and structural integrity, underscoring the risk posed by human encroachment into pristine, undisturbed lands”, the authors added.
In the diary
- 17-20 June: 67th meeting of the Global Environment Fund (GEF) council | Washington DC
- 18-21 June: ICLEI (Local governments for sustainability) World Congress 2024 | São Paulo, Brazil
- 19-21 June: G20 third climate and environment sustainability working group meeting | Manaus, Brazil
- 24-26 June: Organisational meeting of the Preparatory Commission for the Entry Into Force of the BBNJ Agreement and the convening of the first meeting of the Conference of the Parties to the agreement | New York City
This is an online version of Carbon Brief’s fortnightly Cropped email newsletter. Subscribe for free here.
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 19 June 2024: Why food prices are spiking; Bonn climate talks; Plunging polar bear populations 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