From flooding in New Zealand and wildfires in Canada through to drought in the Middle East and extreme heat across the northern hemisphere, last year provided a powerful demonstration of the impacts of climate change.
With global temperatures over the past decade around 1.2C warmer than pre-industrial levels, the impacts already urgently demand adaptation investments to avoid mounting losses.
However, research suggests that existing limits and barriers to adaptation could take decades to overcome, particularly in vulnerable countries. And while adaptation measures are gradually being put in place, how might they be further affected by continued warming?
In our new study, published in One Earth, we investigate how the effectiveness of well-established adaptation options in relation to water changes as the world warms.
Our findings show that the effectiveness of water-related adaptation declines markedly once warming passes 1.5C above pre-industrial levels – from a central estimate (median) of 90% to 69%, 62% and 46% at 2C, 3C and 4C, respectively.
With the implementation of adaptation already lagging behind what is needed, our findings show that warming beyond 1.5C needs to be avoided for effective adaptation to be possible.
Measuring the effectiveness of adaptation
The latest assessment report from the Intergovernmental Panel on Climate Change (IPCC) shows that current adaptation efforts are insufficient to cope with the increasing severity of warming-related impacts across the world.
This “adaptation gap” – the difference between what is needed to reduce impacts and what has been implemented – is growing, despite increasing adaptation efforts across all world regions.
Where adaptation has been documented, many benefits – such as economic gains, better educational outcomes or infrastructure improvements – have been observed. However, we still have very limited evidence and knowledge about how effective adaptation is in reducing climate risks – arguably the key purpose of adaptation.
This is, of course, an inherently difficult thing to measure, as it is not possible to calculate impacts that have been avoided because of adaptation.
Different ideas of how to measure adaptation effectiveness have been put forward. In a very narrow sense, the IPCC defines adaptation effectiveness as the extent to which an adaptation option is anticipated or observed to reduce climate-related risk, an approach we use in our study. More encompassing definitions of effectiveness include the multiple benefits adaptation can have on a broader set of outcomes, such as human well-being and equality.
A better understanding of the risk reduction potential of adaptation is crucial, as climate impacts will become more severe over the next decades. With limited resources to invest, it is essential that informed decisions can be made.
Adaptation as the world warms
In our study, we look at a set of frequently used adaptation interventions in the water and agricultural sectors, which are central in current modelling approaches of future impacts.
We collated a set of published case studies distributed across all world regions. We grouped these options into nine different types of adaptation interventions – shown in the map below.
For example, adaptation measures under “changes in cropping patterns and crop systems” include approaches such as shifting planting dates or substituting different crops. Measures related to “water and soil moisture conservation” include approaches such as reduced tilling (turning of the soil) or introducing mulching (covering topsoil with plant material).
Each case study assesses in detail how a particular option could be implemented according to specific local conditions and provides results on its potential to reduce climate risks.
In many studies, different combinations of measures or different specifications of one measure – for example, shifting planting dates by 10, 20 or 30 days – are tested. Where this leads to different levels of effectiveness, we focus on those specifications that show to be most effective in reducing risk.
Declining effectiveness
To set these case study results into a global context and align them with important levels of warming, as in the IPCC reports, we translate all results into a representation of adaptation effectiveness at 1.5C, 2C, 3C and 4C. To represent effectiveness, we assess the proportion of projected risk that an adaptation option is able to avoid.
Our findings suggest a concerning picture: adaptation options are effective in reducing risks in most assessed settings up to 1.5C of warming, but with increased warming, effectiveness declines across all options and regions.
The central estimate (that is, the median) of adaptation effectiveness across all assessed measures at 1.5C is 90%. However, this declines to a median effectiveness of 69% at 2C and 62% at 3C – a level that current policies could still take warming close to.
At 4C, effectiveness declines even further to a median of 46%, indicating that less than half of projected impacts would be avoided under the adaptation measure.
The decline in effectiveness is most pronounced for adaptation options related to agriculture. For example, changes in cropping patterns and crop systems show high effectiveness at 1.5C, with more than 50% of data points in this category, but the share of highly effective adaptation decreases to 14% at 4C.
At the other end of the scale, we find that energy related adaptation (85%), flood risk reduction measures (78%) and urban water (78%) are the most likely categories to reduce 80% or more of projected risk across all warming levels.
As models do not account for adaptation limits and barriers, effectiveness in practice is likely to be lower than under idealised model conditions we assess in our study.
In many cases, adaptation in a 1.5C world comes with potential co-benefits, where the adaptation option improves conditions more widely, relative to the baseline of current conditions. For example, shifting from rain-fed agriculture to irrigation systems produces co-benefits in multiple cases.
Our findings for adaptation across Africa show that co-benefits could be substantial in closing existing adaptation gaps: 54% of assessed studies indicate potential co-benefits at 1.5C. However, this potential declines to 12% at 4C.
Similarly, in Asia the potential for co-benefits declines from around 56% at 1.5C to 16% at 4C. In Central and South America, our data also shows a shift towards less effective adaptation outcomes. There is no apparent shift in the level of co-benefits that could be achieved, though it must be noted that much fewer studies were available for this region.
In some situations, adaptation becomes not just ineffective in reducing risk, but it actually aggravates the situation, leading to “maladaptation”.
Africa shows the largest share of maladaptive outcomes at all levels of warming. For example, intensifying the cultivation of maize and sorghum in west Africa or earlier planting of maize in Uganda further decreases yields – in addition to climate impacts – rather than reducing projected risk, even at 1.5C warming.
Models often overestimate the potential for adaptation
Currently, adaptation is not well represented in quantitative models. Integrated assessment models provide information on energy system transition pathways to limit warming, but they do not account for climate impacts or costs and potentials for adaptation.
Climate impact models assess the sectoral effects of warming – for example, on agriculture or the water system. Sectoral climate impact models implement selected adaptation measures, such as irrigation in the agricultural sector, for example, but do not account for limitations such as water availability.
But, even more importantly, models do not account for other constraints and limits to adaptation, which have been documented in practice.
Beside financial barriers, which are a fundamental impediment to effective adaptation, there are also constraints and limits related to governance and institutions, availability of information, awareness, human capacity and socio-cultural constraints. Similarly, adaptive capacity plays an important role in the ability to implement effective adaptation.
Consequently, where models include adaptation, they likely overestimate its potential. This is also true for our own assessment: we assess adaptation in a modelled context, where ideal conditions for implementing the respective option are assumed. If additional adaptation constraints and adaptive capacities were considered, the extent to which adaptation can effectively reduce climate risks may be further reduced.
Climate-resilient development requires limiting warming to 1.5C
Our study focuses on a limited set of adaptation options, which are currently frequently used and have direct entry-points into the modelling space. It can be assumed that progress and learning unlock further innovation for adaptation in the future, increasing the options and approaches available to adapt and reduce risk.
However, we also know that additional limits and constraints are likely to affect effectiveness as compared to a modelling environment that does not consider such aspects.
Our findings show that effective adaptation is only truly possible if it occurs alongside ambitious mitigation action that limits warming to 1.5C. Our study also emphasises that adaptation is not an alternative to mitigation, nor can it be seen as a way to allow for a delay in mitigation efforts.
The post Guest post: Climate adaptation becomes less effective as the world warms appeared first on Carbon Brief.
Guest post: Climate adaptation becomes less effective as the world warms
COP31 has finally kicked off in the sunny seaside resort of Antalya – at least for those lucky enough to have made it through the long queues snaking around the sprawling expo centre where the UN climate conference is taking place.
The joint COP presidents, Türkiye’s Murat Kurum and Australia’s Chris Bowen, have presented their priorities to fellow diplomats – including a new goal on electrification, the establishment of a just transition mechanism and better access to climate finance – before the negotiations begin in earnest.
Kurum announced that issues around the summit’s agenda had been resolved over the weekend. African countries had pushed for additional items on adaptation finance and trade, while Nepal wanted formal discussions on mountain issues in the wake of the devastating flooding disaster that struck the country.
Agreement was reached to drop the African request after late-night talks, with a view to continuing discussions on finance elsewhere such as in a dedicated work programme. Mountains and climate change will become a regular agenda item in the UN climate process with fresh dialogues planned on the topic.
COP31 Briefing: What to expect from the Antalya climate summit?
In his speech to the opening plenary, Australia’s environment minister Chris Bowen, who will preside over the negotiations in Antalya, outlined the COP co-presidents’ expectations for the cover decision that will offer a summary of the talks’ main achievements.
“There will be no surprises. This is not about duplicating negotiations. It will not be a lengthy political declaration, but a focused, practical, concrete response to the challenges and opportunities before us,” Bowen said.
It will be “a decision that reflects the urgency of the climate challenge and the enormous opportunities created by the global transition. One that gives confidence to governments, investors, businesses, communities that the world is moving faster and working together,” he added.
UN: El Niño unleashing heat from hottest oceans ever measured
As diplomats gather in Antalya, a new sobering update on the state of the Earth’s climate from the UN’s weather agency should focus minds.
The World Meteorological Organization (WMO) says the world’s oceans now hold more heat than ever measured. A rapidly strengthening El Niño is releasing some of that heat into the atmosphere, pushing temperatures higher on a planet already baked by human-caused climate change.
“El Niño and indeed the state of the global climate in 2026 gives new meaning to the phrase off the charts,” said the WMO’s Secretary General Celeste Saulo. “El Niño doesn’t add new heat to the planet. It releases heat from the ocean, which is the warmest ever measured. There is simply more heat available to release.”
The UN agency says 2026 is on track to be one of the four warmest years on record globally. That would make 2023 to 2026 the four hottest years in 177 years of observations. The global average temperature from January to September was 1.47°C above pre-industrial levels, just below 2024’s record of 1.55°C. The agency expects the final figure for the year to be higher as one of the strongest El Niños on record takes hold.
The current El Niño – a naturally occurring climate pattern – is expected to peak in December and continue until at least February 2027. As a result, the WMO expects global average temperatures to remain “exceptionally” high through late 2026 and into early 2027.
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Bill Hare, CEO of the global science and policy institute Climate Analytics, said that while El Niño will command the headlines, “no one should be in any doubt that the bigger villain is man-made climate change”.
According to the WMO, El Niño typically adds around 0.1–0.2°C to annual global average temperatures. That is a fraction of the warming of more than 1.4°C recorded last year, which is primarily caused by greenhouse gas emissions mainly from burning fossil fuels.
UN boss António Guterres said a “supersized El Niño is colliding with a planet already superheated by manmade climate change”.
“Leaders must get serious by cutting emissions faster, accelerating a just transition from fossil fuels and delivering the finance and protection vulnerable countries need, “ he added.
At the COP31 opening ceremony, a Turkish promotional video struck a suitably apocalyptic note, implying that while nature and life on the planet will continue, humanity may not be a part of it unless countries choose to step up action to curb global warming.
IPCC chief urges governments to decide on report timeline
The chair of the world’s top climate science body has urged governments to take a long-delayed decision on when its next reports should be published so that they can steer climate action.
“Climate action without climate science is rather like a ship without a rudder,” said Jim Skea, the chair of the Intergovernmental Panel on Climate Change (IPCC).
He told the opening session of COP31 that the IPCC “faces operational challenges and reputational risks from the current impasse on the timeline for our three working group reports”.
Since 2024, governments have been unable to agree on whether the AR7 set of reports should be published before or after the next Global Stocktake (GST) of national climate plans in late 2028.
If the flagship reports are published before, they can feed into the agreed response to the second GST. At COP28, the first GST outcome included the landmark commitment to transition away from fossil fuels in energy systems.
Europe, small islands and the least developed countries, plus many Latin American and developed nations, want the IPCC to meet the deadline to inform the second GST.
But around a dozen developing countries plus Russia – led by India and Saudi Arabia – have argued that the reports should come later in order to allow for greater research input from the Global South.
After talks failed and were suspended last month, governments and IPCC scientists will try again to resolve the issue in virtual talks beginning on December 1.
Despite this disagreement among governments, Skea said the IPCC’s “scientific engine room is humming with activity” as scientists continue their work. But, as they are unpaid for their IPCC work, they are finding it increasingly difficult to find time for it alongside their “busy professional and personal lives”.
“In my early days in IPCC, we could plan our meetings literally years ahead. Now our authors don’t know what is expected of them in the early months of 2027,” he lamented.
The post COP31 Bulletin Day 1: Australia says cover decision won’t bring “surprises” appeared first on Climate Home News.
COP31 Bulletin Day 1: Australia says cover decision won’t bring “surprises”
Climate Change
FLIP OFF WOODSIDE TO SAVE SCOTT REEF: Greenpeace, Michael Caton, Thinkerbell mobilise Australia to challenge gas project at Scott Reef
6 November 2026
Greenpeace Australia Pacific has joined forces with Thinkerbell and iconic Australian actor Michael Caton on a major public movement and behaviour change initiative to save Scott Reef, calling on Australians to “flip off” gas corporation Woodside. The company plans to drill for gas at Australia’s largest oceanic reef, home to vulnerable green sea turtles, endangered pygmy blue whales, and thousands of marine species, off the coast of Western Australia.
WATCH THE FULL VIDEO HERE
At the heart of the collaboration is somebody who knows a thing or two about fighting off corporations to protect a home: Michael Caton. Set in a courtroom, Caton gives his voice to a voiceless inhabitant, a green sea turtle, and together they invite the public to show their support to save Scott Reef.
Designed to shift public behaviour and drive national debate, the movement asks the public to tag their MPs – applying direct political pressure on Environment Minister Murray Watt and Prime Minister Albanese Albanese to “flip off” Woodside’s dirty gas project, which would see up to 57 toxic wells drilled around Scott Reef off the coast of Western Australia.
Voiced by Michael Caton and set to a soundtrack provided by Radiohead, the narrative centres on our hero turtle defending her home from corporate overreach in a courtroom showdown. As the turtle defiantly flips her flippers at Woodside, Michael Caton calls on everyday Australians to take a stand and help save her home.
Michael Caton said: “I’m proud to lend my voice to Greenpeace to help save Scott Reef. The marine life out there can’t speak up, so we need to. Some things are too precious to risk.”
Glenn Walker, Head of Nature at Greenpeace Australia Pacific, added: “Woodside’s dirty gas project at Scott Reef, Australia’s largest oceanic reef, is an environmental disaster waiting to happen, threatening thousands of species, including the extremely vulnerable green sea turtles that nest there. By literally flipping off Woodside and Big Gas, Aussies are cutting through corporate spin and sending an unignorable message to Environment Minister Murray Watt and the Albanese government: save Scott Reef.”
Adam Ferrier, co-founder of Thinkerbell, said: “You can fight a corporation in the courtroom forever, but the real power to deliver lasting protection rests in parliament. Right now, our MPs hold an extraordinary opportunity to safeguard Scott Reef for generations to come. I’m proudly from WA, and I know how much the natural environment means to the people and economy of Western Australia. I’m also sure Woodside wants to do the right thing, and with enough public support and government action we’ll together save Scott Reef.
Paul Swann, Chief Creative Tinker at Thinkerbell notes: “When the stakes are this high, polite ads don’t work. You need an unignorable provocation that galvanises people and puts the pressure squarely where it belongs, on our leaders in Canberra. This isn’t just about protecting a reef; it’s about holding power to account.”
Greenpeace has been campaigning to stop Woodside’s dirty gas plans for years, increasing pressure on the Australian government to save Scott Reef from becoming an industrialised gas zone. From actions aboard Woodside’s gas platform to cinemas across Australia, Greenpeace isn’t backing off in their advocacy to save Scott Reef.
Rolling out across OOH, digital, social and cinema with an interactive landing page, this project will be amplified by high-profile figures urging Australians to take action, tag their MPs, and defend Scott Reef. The movement combines cinematic storytelling with organic social mobilsation and earned media, planned via Thinkerbell’s Alchemy model to drive real behaviour change and impact.
Marking their first Australian tour in 15 years, English rock band Radiohead will play 16 arena shows across Perth, Melbourne and Sydney in May and June 2027. A $2 donation is included in every ticket price with proceeds going to Greenpeace Australia Pacific and the Australian Marine Conservation Society. Radiohead will match the final amount raised.
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