Human-caused climate change made the “unprecedented” wildfires that spread across Brazil’s Pantanal wetlands in June 2024 between four and five times more likely, according to a new rapid attribution study.
South America’s Pantanal – the world’s largest tropical wetland – experienced exceptionally hot, dry and windy conditions in June, causing blazes in the region to soar.
The World Weather Attribution (WWA) service finds that the month was the hottest, driest and windiest year in the 45-year record.
The team conducted an attribution study to find the “fingerprint” of climate change on these weather conditions.
They find that, in a world without climate change, these conditions would be very rare – occurring only once every 161 years.
In today’s climate, which has already warmed by 1.2C above pre-industrial temperatures as a result of human-caused warming, these conditions are a one-in-35 year event.
The authors also explore how wildfires in the region could continue to worsen as the planet warms.
They find that if that planet reaches warming levels of 2C, the likelihood of these conditions could double, to once every 18 years.
Soaring fires
The vast Pantanal wetland extends across Brazil, Bolivia and Paraguay.
It is one of the most biodiverse places on earth, home to more than 4,700 plant and animal species.
Every year, hot and dry weather conditions make the wetland prone to wildfires – usually between July and September.
By June this year, intense wildfires were already soaring. The number of Pantanal fires increased by 1,500% in the first half of this year compared to the same period in 2023, according to data from Brazil’s National Institute for Space Research reported by the Brasil de Fato newspaper.
This amounts to more than 1.3m hectares of the wetland burned so far this year – an area around eight times the size of London.
Around 2,500 fires were identified in June, which is the highest number since 1998 and more than six times the level reported in 2020, which was “known as the ‘year of flames,’ when wildfires ravaged the area and sparked widespread outcry”, the Associated Press said.
The region is currently experiencing its worst drought in 70 years, which Brazil’s government has said is being “intensified by climate change and one of the strongest El Niño phenomena in history”.
Prolonged dry periods, high temperatures and land-use change all contribute to wildfire conditions, says Dr Maria Lucia Barbosa, a postdoctoral researcher at the Federal University of São Carlos in Brazil, who was not involved in the attribution study. She tells Carbon Brief:
“While fires are a natural part of the Pantanal ecosystem, the recurrence of extreme fire seasons – such as the current one, shortly after the devastating 2020 fires – suggests that, alongside climate change, a new fire regime may be emerging in the ecosystem, characterised by increased severity and frequency.”
Hot, dry and windy
Wildfire intensity and duration are influenced by a wide range of factors, including weather, vegetation and fire management strategies.
The authors of the new study focus on a metric called the “daily severity rating” (DSR), which combines information on maximum temperature, humidity, wind speed and precipitation. Dr Clair Barnes – a research associate at Imperial College London’s Grantham Institute and author on the study – told a press briefing that this metric “indicates how difficult it is likely to be to control the fire once it starts”.
High temperatures and wind speeds, as well as low humidity and rainfall, are very conducive to wildfires spreading and, therefore, produce a high DSR.
The map below shows the average DSR in the Pantanal in June 2024. It reveals that most of the Pantanal was experiencing wildfire risk above the 1990-2020 average over that month.
The weather conditions in the Pantanal in June 2024 were “really unusual for the time of year”, Barnes said.
To investigate how atypical the weather conditions in June 2024 were, the authors analysed temperature, windiness, rainfall and humidity data from the past 45 years.
The chart below depicts annual average rainfall and annual average daily maximum temperature in the Pantanal over 1979-2024. It shows that over the past 45 years, the average temperature in the Pantanal has been steadily increasing and total rainfall has been decreasing.
The authors find that June 2024 was the hottest, least rainy and windiest June since records began. They also find that the relative humidity was the second lowest on record.
Annual rainfall across the Pantanal has been decreasing over the past 40 years, the authors note. They point out that natural variability and deforestation are known to impact rainfall patterns across South America, but add that climate change “may also be influencing the drying trend”.
Attribution
Attribution is a fast-growing field of climate science that aims to identify the “fingerprint” of climate change on extreme-weather events, such as heatwaves and droughts.
To conduct attribution studies, scientists use models to compare the world as it is today to a “counterfactual” world without human-caused climate change. In this study, the authors investigated the impact of climate change on DSR in the Pantanal region.
They find that in today’s climate – which has already warmed by 1.2C as a result of human activity – fire weather conditions like the ones that drove the wildfires in the Brazilian Pantanal during June 2024 are a “relatively rare event”, and would be expected to occur roughly once every 35 years.
However, they say, if the planet continues to warm, these events could become more likely. If the climate warms to 2C above pre-industrial levels, the likelihood of these fire conditions will double compared to today.
The graphic below shows how often June fire weather conditions, such as those seen in the Brazilian Pantanal in June 2024, could be expected under different warming levels.
The square on the left shows a world without climate change, in which these DSR levels would happen once every 161 years. The middle square shows that in today’s climate, the DSR is a one-in-35 year event. And the square on the right shows that in a 2C world, a June DSR like that of 2024 could be expected once every 18 years.
The authors also investigate how climate change affected DSR “intensity”. They find that human-induced warming from burning fossil fuels increased the June 2024 DSR by about 40%.
The authors add that as the climate continues to warm, this trend is likely to worsen. The authors warn that if warming reaches 2C above pre-industrial temperatures, similar June fire weather conditions will become 17% “more impactful”.
(These findings are yet to be published in a peer-reviewed journal. However, the methods used in the analysis have been published in previous attribution studies.)
Fire impacts
Wildfires have wide-ranging impacts on people and nature in the Pantanal. In one example, a 2021 study found that around 17m vertebrates were “killed immediately” by the fires in 2020.
Wildfires can “devastate [the] livelihoods” of people living in the Pantanal and “pose significant health risks” from the resulting smoke, Barbosa says.
She notes that wildfires release CO2 into the atmosphere, contributing to climate change, and they “lead to widespread loss of habitat, endanger wildlife and disrupt ecological balances”. She tells Carbon Brief:
“Species that are already threatened or have limited ranges are particularly vulnerable to habitat destruction caused by fires.
“Repeated fires can push fire-sensitive vegetation into a state of permanent degradation, further threatening the ecological integrity of the region.”
Some fires are permitted for agricultural purposes – such as to burn degraded pasture – during the rainy season, from around November to April. This practice is banned in the drier summer months, but a 2020 piece from Mongabay notes that “in reality, the ban is not always respected and enforcement is haphazard”.
Filippe Santos, a researcher at Portugal’s University of Évora and one of the authors of the study, told a press briefing that “fire is part of the dynamics” of the Pantanal – when it is controlled.
Low-intensity fires allow animals “time to leave” the area, he said, adding:
“What we see with wildfires, is that this does not happen, because the fire is so intense and on such a large scale that animals don’t have time to run away.”
The “highly intense” wildfires also “don’t give nature enough time to recover”, Santos says.
In June, Brazil’s environment minister, Marina Silva, told the government news agency Agencia Brasil that the country is “facing one of the worst situations ever seen in the Pantanal”, adding that the fires are heightened by climate extremes and criminal activities.
Most Pantanal fires are caused by human activity, a 2022 study found. Police in Brazil are investigating the “possible culprits” behind 18 fire outbreaks in the region, Silva said last month.
In recent weeks, a law to improve coordination on tackling fires took effect in Brazil.
A statement from the Institute for Society, Population and Nature, a Brazilian NGO, says this new policy is a “significant milestone” and will establish “guidelines for the practice of integrated fire management across all biomes and territories in the country”.
Barbosa says it will be a “challenge” to implement this policy. She would like to see a “comprehensive national early warning system for multiple hazards to ensure risk reduction” for a range of threats – including wildfires. She tells Carbon Brief:
“Collaboration with local communities, firefighters and brigades is crucial for prevention and response efforts…A coordinated approach that integrates all stakeholders, along with the establishment of a national fund dedicated to fire management, is essential for mitigating the impacts of future fire seasons.”
The post Climate change made the ‘supercharged’ 2024 Pantanal wildfires 40% more intense appeared first on Carbon Brief.
Climate change made the ‘supercharged’ 2024 Pantanal wildfires 40% more intense
Cristina Rumbaitis del Rio is a senior advisor on adaptation and resilience and Pan Ei Ei Phyoe is a climate adaptation and resilience consultant with the United Nations Foundation.
COP 30 compels the world to make a decision. Already 3.6 billion people are highly vulnerable to rapidly worsening climate impacts such as droughts, floods, and heat stress. Meanwhile, Glasgow-era climate finance commitments are expiring, and elements of the Global Goal on Adaptation (GGA) are yet to be finalized.
This November provides the opportunity to elevate the issue of adaptation and resilience – and for countries to demonstrate they grasp the urgency and are prepared to act.
Success at COP30 will hinge on how three key questions are answered:
- Will countries agree on a new adaptation finance target backed with real commitments?
- Will countries finalize architecture to track progress toward the Global Goal on Adaptation and implement the UAE Targets for Global Climate Resilience?
- Will adaptation receive elevated political attention at COP30?
A new adaptation finance target backed with real commitments
Belém will test whether negotiators can agree on a new adaptation finance goal that is anchored in clear targets, timelines, and accountability. The Glasgow Climate Pact’s goal to double adaptation finance is set to reach its deadline at the end of this year and countries are facing the question of what, if anything, comes next.
The form of the finance goal also matters: will it be a provision-based target ensuring measurable public contributions, or a mobilization target dependent on less transparent private leverage?
After two consecutive years of falling short, all eyes will be on whether the Adaptation Fund can finally meet its mobilization target and secure a multi-year replenishment to deliver predictable support.
Multilateral development banks (MDBs) are under pressure to demonstrate how to integrate adaptation into country-platform approaches including aligning finance for accelerated country-driven action and providing fast-start financing for implementation of National Adaptation Plans. NAPs have been completed by 67 developing countries and are underway in another 77 countries.
Climate adaptation can’t be just for the rich, COP30 president says
Vulnerable countries currently need an estimated $215 billion-$387 billion annually to adapt to climate change, far exceeding available funding. And developed countries face growing expectations to renew or grow their bilateral commitments beyond Glasgow-era pledges that are expiring this year or next.
Without tangible new finance commitments, the ambition of the Global Goal on Adaptation risks remaining rhetorical.
System to track progress on the Global Goal on Adaptation
The GGA still has no mechanism to measure progress, despite being established under the Paris Agreement in 2015, shaped through multiple work programs since 2021, and further expanded by the UAE Framework for Global Climate Resilience of COP28 which set 11 targets and launched the UAE-Belém Work Programme.
Agreeing on a robust, streamlined indicator set that is both scientifically sound and usable by countries with differing capacities will be one of the hardest tasks at COP 30. These outcomes will be a test of whether we can move from measuring resilience to building it.
Foreign aid cuts put adaptation finance pledge at risk, NGOs warn
Negotiators must settle the inclusion of equitable means-of-implementation indicators covering finance, technology, and capacity building. Finally, they must decide what comes next under the UN Framework Convention on Climate Change to ensure the UAE targets are acted upon within the next two to five years.
Those targets include seven that set resilience priorities for water and sanitation, food and agriculture, health, ecosystems, infrastructure, livelihoods and cultural heritage.
Adaptation needs greater political attention at COP30
Last week, COP30 President Corrêa do Lago released the first-ever COP presidency letter focused on elevating adaptation, calling for solutions that will make Belém the “COP of adaptation implementation”. His task now is to embed that principle across every strand of COP30’s delivery architecture.
One test lies in how realistically adaptation is integrated into the Baku-to-Belém Roadmap to $1.3 trillion to be released by the presidency. The implementation of the COP 30 Action Agenda, which provides a blueprint for collective climate action and solutions, could become the bridge between political vision and practical delivery on adaptation.
Questions remain on whether Brazil’s leadership on adaptation thus far will position adaptation as a political priority that will be reflected in leaders’ statements at the opening of COP30. The inaugural High-level Dialogue on Adaptation – hosted by the outgoing COP President Azerbaijan and Brazil – is another opportunity where countries can reaffirm and institutionalize adaptation as a permanent pillar of climate action.
In the role as the host and president of COP30, Brazil has repeatedly stressed the importance of matching adaptation with actual resources and accountability, highlighting adaptation as one of the five guiding stars of the Paris Agreement alongside mitigation, finance, technology, and capacity building.
With the right outcomes in Belém on finance targets, measurement systems, and political commitments, COP30 could be remembered as the moment adaptation financing and implementation finally matched the scale of the challenge.
The post Can COP30 mark a turning point for climate adaptation? appeared first on Climate Home News.
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