As much as half of the Amazon will face several “unprecedented” stressors that could push the forest towards a major tipping point by 2050, new research finds.
The largest rainforest in the world is already under pressure from climate change, deforestation, biodiversity loss and extreme weather.
Researchers analysed data on five key drivers of water stress in the Amazon and looked at how these pressures could lead to “local, regional or even biome-wide forest collapse”.
The new study, published in Nature, finds that by 2050, between 10 and 47% of the Amazon forest will be exposed to “compounding disturbances” that “may trigger unexpected ecosystem transitions”. This could result in large swathes of lush rainforest shifting to dry savannah.
One author of the study tells Carbon Brief that this prospect by mid-century is “very scary”.
The study notes that the complexity of the Amazon “adds uncertainty about future dynamics” and that there are still “opportunities for action”.
The findings highlight the likelihood that “climate change will continue to affect the forest in very unpredictable ways”, a scientist not involved in the study says.
Amazon pressures
The Amazon forest stores a huge amount of carbon and houses at least 10% of the world’s biodiversity. It faces an uncertain future largely due to the effects of deforestation and climate change.
Last year, the Amazon river basin experienced an “exceptional drought” that was 30 times more likely to occur due to climate change, a rapid attribution study found.
Around 20% of the Amazon has already been deforested and a further 6% is “highly degraded”.
According to several studies, the Brazilian section of the Amazon is now an overall net “source” of carbon, rather than a “sink”, due to a number of factors including deforestation.
Scientists have long warned that climate change and human-driven deforestation could push the Amazon rainforest past a “tipping point” – a threshold that, if crossed, would see the “dieback” of large amounts of dense Amazon rainforest and a shift into permanent, dry savannah.
This would be characterised by a mixed tree and grassland system with an open canopy that allows the soil to become much hotter and drier.
Previous studies suggest that the Amazon could be pushed beyond this tipping point if forest loss exceeds 40%. Other research published last October found that recent drying over the Amazon could be the “first warning signal” that the rainforest is approaching a tipping point.
The new study examines five key drivers of water stress in the Amazon – global warming, annual rainfall, rainfall seasonality intensity, dry season length and accumulated deforestation – to estimate the critical limits of these issues for the Amazon.
The researchers use existing evidence from palaeorecords, observational data and modelling studies. For example, they find that rainfall levels below 1,000mm each year could result in “forests becom[ing] rare and unstable”.
For floodplain ecosystems, this critical threshold was estimated at 1,500mm per year. This implies that “floodplain forests may be the first to collapse in a drier future”, the study says.
Based on this analysis, the researchers estimate that these drivers could, in combination, potentially lead to a large-scale Amazon tipping point by 2050.
Dr Bernardo Flores, the lead author of the study and a researcher at the Federal University of Santa Catarina, Brazil, says the study aims to show the effects of these combined pressures. He tells Carbon Brief:
“It is surprising how the combination of stressors and disturbances are already affecting parts of the central Amazon… [which] can already transition into different ecosystems.
“Then, when you put everything together, the possibility that by 2050 we could cross this tipping point, a large-scale tipping point, is very scary and I didn’t really think it could be so soon.”
Ecosystem transitions
The findings highlight how the combination of different disturbances – such as intensified droughts and fires – could trigger “unexpected ecosystem transitions even in remote and central parts” of the Amazon.
Flores says that most of the Amazon is warming “significantly” and many areas are becoming drier than in previous years, adding:
“When you combine this with things like deforestation, fires and logging…when these disturbances act together, they can have a synergistic effect.”
These issues occurring at the same time “could cause large parts of the Amazon to transition into a different ecosystem”, Flores says. He tells Carbon Brief:
“When you lose more forest, you could cross that tipping point in forest loss and then trigger a large-scale tipping point when the whole system would start accelerating to a large-scale collapse.”
The study finds that around half (47%) of the Amazon biome has a moderate potential for these changes. Larger, remote areas covering 53% of the Amazon have a low chance of ecosystem transition – which mostly accounts for protected areas and Indigenous territories.
Within these figures, the researchers find that 10% of the Amazon has a “relatively high transition potential” – meaning that it is already seeing more than two types of disturbances.
The study then looks at the three “most plausible” trajectories for Amazon ecosystems impacted by compounding stressors. These are: degraded forest, white-sand savannah and degraded open-canopy ecosystem.
Using examples of existing “disturbed” forests across the Amazon, the researchers identify these as possible futures for different parts of the forest. The figure below shows the different disturbances and feedback loops in each of these ecosystems.
1.5C ‘safe boundary’
Prof Dominick Spracklen, a professor of biosphere-atmosphere interactions at the University of Leeds, who was not involved in the study, says the research “highlights the urgency to keep both global warming and deforestation within safe limits” to protect the Amazon.
Based on their analysis, the authors say that staying within 1.5C of global warming (the aspirational limit included under the Paris Agreement) is a “safe boundary” for the Amazon forest to avoid large-scale transformations.
(A 2020 study concluded that there is a “significant likelihood” that multiple tipping points will be crossed around the world if temperatures exceed 1.5C.)
The new study suggests that ending deforestation and forest degradation – alongside boosting restoration in degraded areas – are key factors in improving the state of the Amazon.
However, Flores notes that action to stop deforestation without also stopping greenhouse gas emissions may be “useless” to prevent the forest reaching a major tipping point.
The rate of deforestation in Brazil’s Amazon soared under former president Jair Bolsonaro, but has almost halved in 2023 since Luiz Inácio Lula da Silva took over office. Meanwhile, forest loss in the Bolivian sections of the Amazon reached record-high levels in 2022.
Spracklen says this disparity “highlights the need for a pan-Amazon alliance to help collaboratively reduce deforestation”. (Last year, the leaders of the eight Amazon basin countries committed to work together to protect the rainforest – but stopped short of agreeing to end deforestation.)
Dr Patricia Pinho, the deputy science director at the Amazon Environmental Research Institute (IPAM), who was not involved in the study, says that more research is needed to assess the “cascading” effects of tipping points for people living in forest regions. She tells Carbon Brief:
“From the point of view of some people in the Amazon…A tipping point of the forest has been reached already. People are already feeling the limits of cultivating their traditional foods or encountering the biodiversity that they use for rituals, for tradition, for foods, for medicine.”
Another study author, Dr David Lapola, a researcher at the University of Campinas in Brazil and a Carbon Brief contributing editor, says the research was “necessary to investigate other potential drivers” towards this tipping point. He adds:
“Of course, there needs to be more research because even though the article points out possibilities, there is still a lot of uncertainty surrounding how the tipping point would operate and the chances of it [happening].”
Pinho adds that the “quite depressing” findings raise a lot of “red flag” issues around the Amazon, saying:
“If we don’t [take] action right now as soon as possible to avoid greenhouse emissions… climate change will continue to affect the forest in very unpredictable ways.”
She says the study is a “great contribution” to Amazon tipping point research, noting that “the bad news is that we are approaching sooner than expected those critical transitions”.
The post ‘Unprecedented’ stress in up to half of the Amazon may lead to tipping point by 2050 appeared first on Carbon Brief.
‘Unprecedented’ stress in up to half of the Amazon may lead to tipping point by 2050
Climate Change
As a Plastic Waste Plant Violates Pollution Rules, Its Owner Makes the Case for a Second Location
Freepoint Eco-Systems seeks to become a major player in so-called “chemical recycling.” Some residents and environmental advocates are fighting back.
Belching smoke from a new plastic waste processing plant in central Ohio has stirred opposition to an even larger “chemical recycling” factory planned for Arizona by the same company.
As a Plastic Waste Plant Violates Pollution Rules, Its Owner Makes the Case for a Second Location
Climate Change
Revealed: Scientists tell Colombia fossil-fuel transition summit to ‘halt new expansion’
Countries attending a first-of-its-kind fossil-fuel summit have been asked to consider “action recommendations” such as “halting all new fossil-fuel expansion” and “reject[ing] gas as a bridging fuel”, according to a preliminary scientific report seen by Carbon Brief.
Around 50 nations will gather in Santa Marta, Colombia from 24-29 April to debate ways to “transition away” from fossil fuels, in the face of worsening climate change and sky-high oil prices.
The talks come after a large group of nations campaigned for, but ultimately failed, to get all countries to formally agree to a “roadmap” away from fossil fuels at the COP30 climate summit in Brazil in November.
The nations gathering in Santa Marta for the summit co-hosted by Colombia and the Netherlands, call themselves the “coalition of the willing”.
Ahead of country officials arriving in Santa Marta, a global group of academics will gather in the city this week to present and discuss the latest scientific evidence on fossil-fuel phaseout, which will then inform debate among policymakers.
A preliminary scientific “synthesis report” circulated to governments attending the talks and seen by Carbon Brief offers 12 “action insights” for countries to consider, along with a wide range of “action recommendations”.
These recommendations range from “phase out subsidies on fossil-fuel production and consumption” to “kick-start a forum to develop a legal framework to ban fossil-fuel advertisements”.
‘Rapid’ assessment
The preliminary scientific report seen by Carbon Brief – titled, “Action insights for the Santa Marta process” – is the result of some rapid work by an “ad-hoc” group of around 24 scientists.
It is designed to present governments attending the talks with concrete and actionable recommendations for transitioning away from fossil fuels.
The preliminary version, which includes recommendations such as “halting all new fossil fuel expansion”, has already been circulated to governments, with a view that this could help them to prepare for the talks in advance.
It will be further debated and refined by scientists attending the academic segment of the Santa Marta talks, before a final version is made public towards the end of April, Carbon Brief understands.
The process to produce the report began shortly after the conclusion of the COP30 climate summit in Brazil in November, explains its lead author, Dr Friedrich Bohn, a research scientist and co-founder of the Earth Resilience Institute in Germany. He tells Carbon Brief:
“When [Brazil] announced there would be a Santa Marta conference led by Colombia and the Netherlands, I was sitting listening with a small group of scientists. We thought: ‘This is great news, but it should be supported by scientific expertise.’”
One of the members of Bohn’s group had a pre-existing relationship with the Colombian government, allowing a dialogue to quickly be established, he continues:
“In the beginning, the idea was to just write a peer-reviewed paper. But, because of this close connection to the Colombian government and some feedback from them, the synthesis paper evolved.”
The report came out of a “very rapidly evolved process” that relied on the “goodwill” and “enthusiasm” of the academics involved, adds coordinating author Prof Frank Jotzo, a professor of climate change economics at Australian National University. (Jotzo is a former Carbon Brief contributing editor.) He tells Carbon Brief:
“It’s an attempt to get broad coverage on relevant topics from researchers with good expertise and reputation.”
The group of 24 scientists involved spent around two months compiling the “action insights” for the report, drawing on their expertise and the latest available research, says Jotzo.
Given the rapid nature of the report, it does not aim to be “completist”, has not been externally reviewed and did not follow a stringent process for author selection comparable to that used by Intergovernmental Panel on Climate Change (IPCC) reports, he adds.
The contributors to the report currently skew to the global north and include more men than women, adds Bohn.
‘Direct guidance’
In a departure from IPCC reports, the preliminary Santa Marta synthesis report offers “very direct guidance to action”, says Jotzo.
The report lists 12 “action insights”, each with three “action recommendations”. (The list was cut down from a shortlist of about 40-50 insights, Carbon Brief understands.)
One of the most striking in the draft is “action insight 5”, which says:
“Take immediate measures to prevent future emissions. Ban new fossil infrastructure, mandate deep methane cuts, accelerate electrification and inscribe fossil-fuel phase-down targets in NDCs [nationally determined contributions] and clean-energy pathways support to low and middle income countries (LMICs).”
The accompanying three “action recommendations” include “halting all new fossil-fuel extraction and infrastructure projects ahead of a final investment decision”, “implementing deep, legally binding methane cuts in the energy sector” and “inscrib[ing] targets for fossil-fuel phase down, electrification and green exports in NDCs”.
(The draft report includes multiple references to “phasing out” and “phasing down” fossil fuels, rather than the “transition away from fossil fuels” language that was, ultimately, agreed by countries at the COP28 UN climate talks in Dubai in 2023.)
Another action insight says “public support for climate action is broadly underestimated and undermined by interest groups, but it can be strengthened by debunking greenwashing narratives”.
One recommendation for this insight is that nations “reject natural gas as a bridging technology and CCS [carbon capture and storage] techniques as scalable compensation”.
In a letter introducing the report to governments and civil society, the scientists note that making direct recommendations is a “challenge for our community”, but added:
“However, in the spirit of a constructive collaboration between science and policymaking, we allowed ourselves to identify some potential courses of action that our community would recommend for each particular issue – and we invite you to weigh these against your own circumstances and pick up whatever seems most useful for you and your colleagues.”
The prescriptiveness of the recommendations – something strictly prohibited in IPCC reports – was an explicit request from the Colombian government, Bohn says:
“The idea of actionable recommendations was introduced by the Colombian government.
“There was some discussion within the team about this. It’s a tricky area when you leave science and move to consultation. Therefore, we agreed, in the end, to call them ‘actionable recommendations’ and to make them as precise as possible, from the scientific perspective.”
Jotzo, a veteran of the IPCC process, tells Carbon Brief that it was “very liberating” to work on a report with a “free-form process”:
“The bulk of policy-related research is very readily deployed to recommendations pointing out what countries could do. The IPCC process, for example, just doesn’t allow that. As far as the summary for policymakers in the IPCC is concerned, it will usually be governments that filter out anything that could be interpreted as a specific recommendation.”
He adds that the hope is that some of the action insights might be reflected in the high-level segment of the Santa Marta conference:
“No one is under any illusions that governments will walk away from the Santa Marta conference and will have made a decision to implement recommendations one, seven and nine – or something like that. But it is a chance to insert directly applicable action points into national and plurilateral policy agendas.”
Colombia calling
The preliminary report will be further debated and refined by scientists attending the “pre-academic segment” of the Santa Marta talks.
This is taking place from 24-26 April, ahead of the “high-level segment” involving ministers and other policymakers from 28-29 April.
The pre-academic segment will also separately see the launch of a new advisory panel on fossil-fuel transition and a scientifically led roadmap for how Colombia can transition away from fossil fuels, Carbon Brief understands.
The high-level segment is expected to be attended by representatives from around 50 countries, including COP31 host Turkey and major oil-and-gas producers such as the UK, Canada, Australia, Brazil and Norway.
Countries expected to attend account for one-third of global fossil-fuel demand and one-fifth of global production, according to the Colombian government.
At the end of the conference, countries are due to release a report featuring a “menu of solutions” for transitioning away from fossil fuels, according to Colombia’s environment minister Irene Vélez Torres.
This report is in turn set to inform a global “roadmap” on transitioning away from fossil fuels being developed by the Brazilian COP30 presidency, which is due to be presented at COP31 in Turkey this November.
The Brazilian COP30 presidency offered to bring forward a “voluntary” fossil-fuel transition “roadmap” outside of the official COP process, after countries failed to formally agree to one during negotiations in Belém.
The post Revealed: Scientists tell Colombia fossil-fuel transition summit to ‘halt new expansion’ appeared first on Carbon Brief.
Revealed: Scientists tell Colombia fossil-fuel transition summit to ‘halt new expansion’
Technical Assessment of Woodside’s Browse Pygmy Blue Whale Management Plan
To secure their approvals, Woodside had to develop a plan for how they would manage the significant risks to threatened green turtles if the project proceeds. We’ve had two independent scientists provide a technical assessment of Woodside’s management plan for whales and turtles and their findings are gobsmacking.
Woodside’s Browse gas project could make Scott Reef’s unique green turtles extinct.
Woodside’s Browse gas project could delay or prevent the population recovery of the endangered pygmy blue whales that rely on Scott Reef, heightening their extinction risk.
Technical Assessment of Woodside’s Browse Turtle Management Plan
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Revealed: Scientists tell Colombia fossil-fuel transition summit to ‘halt new expansion’
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