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.
This is an online version of Carbon Brief’s fortnightly Cropped email newsletter. Subscribe for free here.
Key developments
Drought around the world
GLOBAL DROUGHT: Drought affected 1.84 billion people in 2022 and 2023 – nearly one-quarter of all people on Earth – “the vast majority” of whom live in low- and middle-income countries, the New York Times wrote. The figures come from the UN’s “Global Drought Snapshot” report. The New York Times explained that the droughts “come at a time of record-high global temperatures and rising food-price inflation”, with conflicts such as Ukraine “punishing the world’s poorest people”. The outlet said: “Some of the current abnormally dry, hot conditions are made worse by the burning of fossil fuels that cause climate change.” It added that the onset of El Niño last year “has also very likely contributed” to the heat and drought.
SHIP-SHAPE: Drought is also impacting the flow of global shipping, as “critical shipping delays” have plagued the Panama Canal, Bloomberg reported. The canal handles around $270bn of global trade each year – about 5% of total commerce. “Potential solutions”, the outlet wrote, “include an artificial lake to pump water into the canal and cloud seeding to boost rainfall”. But, it added, it is unclear if either option is feasible – and neither would be able to be implemented quickly. Moller-Maersk, the Danish shipping giant, has announced that it will “turn to rail to move some cargo”, according to Reuters. The newswire added that the Panama Canal Authority is “developing short- and long-term solutions to limit climate anomalies’ impact on the trade route”.
LOOKING FORWARD: The Global Drought Monitor Consortium released its 2023 summary report, which found that the record heat experienced last year “affected the water cycle in various ways”, including by exacerbating drought conditions. Looking forward, the report said, “the greatest risk of developing or intensifying drought” over the next year is in much of central and South America, southern Africa and western Australia. According to the Global Drought Monitor, global precipitation was “close to average” last year, with no clear trend. But, it added, “the number of record low monthly precipitation totals was the highest on the record”. For more on last year’s record heat, see Carbon Brief’s 2023 state of the climate analysis, published last week.
New year, new species
RIGHT ON KEW: From Antarctic rocks to the top of a volcano, scientists at the Royal Botanical Gardens, Kew, discovered 74 new species of plants and fungi in 2023, BBC News reported. Of these, “at least one will probably already have been lost”, the story said. Scientists are calling for the immediate protection of new discoveries that include species of Antarctic fungi and a pair of trees living almost entirely underground in highland Angola. Nevertheless, senior research leader at Kew, Dr Martin Cheek, told BBC News: “The sheer sense of wonder when you realise that you’ve found a species that is totally unknown to the rest of the world’s scientists and, in fact, everyone else on the planet, in many cases, is what makes life worth living.”
ANIMAL INVENTORY: Separately, the Zoological Survey of India declared that 664 new animal species were discovered in 2022, according to a story by Mid-day profiling the wildlife researchers behind these finds. “It is both hopeful and intriguing to know that there is something new in a particular patch of forest…but it is tough not to be worried by changes,” said University of Arkansas researcher Shantanu Joshi, who discovered a rare dragonfly species and gave a local family credit as co-authors of his research. Citizens and communities aiding these discoveries are “a contrast to the grim reality” of having to witness “radical and swift destruction of habitats” first-hand, the story added. But they face “systemic challenges”, including the lack of funding and opportunities and the state of documentation and inventorying in India, the story said.
DEEP-SEA DISCOVERY: Meanwhile, New Scientist reported that four new species of deep-sea octopus were discovered at depths of 3km near hydrothermal vents off the coast of Costa Rica. “It’s like walking in a forest you’ve never been in before, with a flashlight, trying to find a hot spring,” said expedition co-leader Dr Beth Orcutt from the Bigelow Laboratory for Ocean Sciences. Separately, the “largest ever study of ocean DNA” revealed fungi species in the ocean’s “twilight zone” that could yield “new drugs that may match the power of penicillin”, the Guardian reported. And a feature in Hakai Magazine looked at how quickly animals can evolve to adapt to a rapidly changing climate. For Prof Luciano Beheregaray, a molecular ecologist at Flinders University, “hybridisation” is key. He told Hakai: “We could manage populations at risk by actively bringing in genetic material that might help them adapt…It would be better than to sit and watch extinction take place before our eyes.”
Spotlight
Deep-sea disquiet
In this spotlight, Carbon Brief unpacks Norway’s recent decision to allow exploratory seabed mining in its national waters and explains what the next year holds for deep-sea mining approvals.
In December, Norway made headlines around the world as its centre-left minority government struck a deal with two conservative parties to allow companies to explore the seabed of the Arctic Ocean for critical minerals, as covered in Cropped at the time. Last week, the Storting – the Norwegian parliament – officially passed the measure, “against massive criticism from scientists, fisheries organisations and the international community”, EU Reporter wrote.
Seabed mining can involve “hoovering” up rocks called “polymetallic nodules” from the seafloor. These rocks contain metals including manganese, cobalt and nickel, many of which are critical for batteries and other technologies. However, it can also look more like land-based mining – which is “more invasive”, according to Wired.
There are a “huge number of unknowns” associated with seabed mining, Prof David Schoeman, a quantitative ecologist at the University of the Sunshine Coast in Australia, told Carbon Brief last year.
In part, that is because deep-sea habitats are “poorly understood, diverse, fragile and extremely slow to recover from disturbance”, Pepe Clarke, global oceans practice lead at WWF-International, told Carbon Brief. In addition, research previously covered by Carbon Brief has found that seabed mining could negatively impact other important industries, such as fisheries.
At present, the governmental approval covers only exploration for critical minerals, not exploitation of such resources. But, Clarke said: “You don’t explore unless you’re looking for something.”
“Many states view Norway as a sustainable manager of its ocean areas, so what Norway practises and allows in terms of ocean industry is important,” Ida Soltvedt Hvinden of the Fridtjof Nansen Institute told Wired. But it does not directly affect the ongoing negotiations at the International Seabed Authority (ISA), which governs the use of the seafloor in areas beyond any national waters. Twenty-four countries, including the UK, are currently calling for a moratorium on seabed exploration until the risks of environmental harm can be better understood.
There are, essentially, two ways that such a moratorium could come into effect. It could be adopted at the ISA through a formal process. Or, a de facto moratorium could take hold if “a sufficiently large bloc of countries at the ISA committed to withholding support for future mining approvals”, Clarke explained.
Discussions around a seabed exploration moratorium will continue at the ISA this year, with the council scheduled to meet twice and the assembly convening at the end of July. However, Clarke said, it is “unlikely” that the issue will be resolved in the coming year. According to BBC News, a final vote at the ISA is “expected within 24 months”.
News and views
MIXED SIGNALS: Reuters reported that deforestation in the Brazilian Amazon rainforest halved in 2023 compared to 2022, hitting its lowest levels since 2018. The newswire called it “a major win for President Luiz Inacio Lula da Silva in his first year in office”. But, it pointed out, the area cleared last year is still “six times the size of New York City” – underscoring challenges in Lula’s pledge to end illegal deforestation by 2030. Meanwhile, the Financial Times reported that deforestation in the Cerrado savannah in eastern Brazil rose by 43% in the same time period, with campaigners calling it a “major stain” on Lula’s environmental credentials. Speaking to the FT, André Guimarães of the Amazon Environmental Research Institute said: “Unlike the Amazon, where prevention can be done via law enforcement, in the Cerrado, incentives have to be created for landowners to give up their right to deforest.”
POLAR PATHOGENS: Alaska state officials confirmed that a polar bear found dead in October was killed by the “highly pathogenic avian influenza that is circulating among animal populations around the world”, the Alaska Beacon reported. The state veterinarian said that the death was the first-ever such report in a polar bear anywhere in the world. The outlet added that the death “is a sign of the unusually persistent and lethal hold that this strain” has on wild animal populations. At the other end of the world, the first bird flu deaths in elephant and fur seals were confirmed on South Georgia Island, a UK territory in the sub-Antarctic. “Hundreds of elephant seals were found dead” on the island, the Guardian reported, adding that there “have also been increased deaths of fur seals, kelp gulls and brown skua at several other sites”.
OVERSATURATED: Important crop-growing areas of England were hit by “widespread flooding”, leading to “concerns about shortages of carrots and other root vegetables”, according to the Times. “Prolonged rain” during Storm Henk earlier this month resulted in sustained flooding. The newspaper wrote that “saturated ground is a problem for growers because as long as the crop is in the ground, there’s greater risk of it rotting”. Prof Hannah Cloke, a hydrologist at the University of Reading, pointed out that the floods compounded issues brought on by a “very wet autumn”. She told the outlet: “October’s Storm Babet is already likely to have caused big impacts on potato and cereal crops and damaged this year’s harvest.”
SEED CHANGE: After two consecutive years of heatwaves and other extreme weather taking a toll on yields from India’s wheat bowl, government surveys showed that 80% of the “wheat area this year has been sown with climate-resilient and bio-fortified varieties,” the Hindustan Times reported. The 2022 heatwave reduced India’s wheat yield by 4.5% “compared to a year with normal weather”, according to a study by the University of British Columbia quoted in the story. Separately, Mongabay reported on the combined impact of air pollution and climate change on India’s food security. And Context News reported that while past election manifestos have made only “passing references” to climate impacts on farmers, “crop-threatening erratic monsoon rains and heatwaves could make headlines as campaigning starts” in India’s big general election in April.
SNOWLESS SLOPES: Gulmarg, a skiing town in the Indian-controlled part of Kashmir, witnessed a lack of snow on its ski slopes “due to unseasonably dry weather”, CNN reported, despite being one of the world’s highest ski resorts. The region saw an “80% rain deficit” in December, the Associated Press reported, with daytime temperatures “sometimes at least 6C higher than the norm”. The head of the India Meteorological Department’s Kashmir office, Mukhtar Ahmed, told the newswire that in the last few years, “winter has shortened due to global warming”. This has affected hydropower generation, tourism and agriculture, the article reported, forcing “distressed” farmers to change the crops they plant. Ahmed added that “timely snowfall is crucial to recharge the region’s thousands of glaciers” that sustain agriculture and horticulture. Scientists told the Third Pole that snowless winters and more extreme summer rain could become the norm.
GAZA FAMINE: “Pockets of famine” already exist in Gaza according to UN aid officials, the Guardian reported, with parents sacrificing food for their kids, cooking fuel “almost impossible to find” and 25 kilo sacks of flour now six times their pre-war price. However, lack of data on child malnutrition and mortality meant formal criteria for declaring a famine had not been met, the story said. In a joint statement, the World Health Organisation, World Food Programme and UNICEF said new aid routes must be opened to Gaza, more trucks must be allowed in and aid workers must be protected. According to doctors in Gaza, children “weakened by lack of food had died from hypothermia” and babies born to undernourished mothers “had not survived for more than a few days”.
Watch, read, listen
TRACKED CHANGES: In a news feature, Nature examined how scientists are using gene-editing to domesticate wild plants and concerns around the exploitation of Indigenous and traditional knowledge.
GRISLY NEWS: Are US authorities attributing wildlife declines to predators and overlooking climate impacts on biodiversity? A long-read in Grist unpacked how this has played out in Alaska.
NUTS ABOUT CHESTNUTS: In the Atlantic, staff writer Katherine J Wu explored the downfall of the American chestnut tree and scientists’ attempts to restore the species to its native range.
WHAT’S IN A NAME?: An article in Atmos argued that the way humans talk about nature shapes their relationship to it – and asked whether “we [should] be paying more attention to the words we use?”.
New science
Severe 21st-century ocean acidification in Antarctic marine protected areas
Nature Communications
A new study found that even under intermediate warming over the next century, proposed and existing marine protected areas in the Antarctic will experience “severe” ocean acidification. Using a high-resolution model of the ocean, sea ice and biogeochemistry, researchers projected future ocean acidification under four emissions scenarios. They found that pH in the upper 200 metres of the ocean may decline by up to 0.36, and that these declines will be most severe in coastal areas, where organisms are most sensitive to acidification. The researchers “call for strong emission-mitigation efforts and further management strategies to reduce pressures on ecosystems”.
Consistent patterns of common species across tropical tree communities
Nature
Around 1,050 species make up half of the Earth’s 800bn tropical trees, according to new research. The study, with 357 authors, investigated patterns of abundance of common tree species using inventory data for more than one million trees in old-growth tropical forests across Africa, Amazonia, and south-east Asia. The authors found that despite different histories, there were consistent patterns in common tree species across all continents, suggesting that the “fundamental mechanisms of tree community assembly may apply to all tropical forests”. While their findings “should not detract” from the focus on rare and endemic species, the researchers conclude that it “open[s] new opportunities to understand the world’s most diverse forests”.
Living in harmony with nature is achievable only as a non-ideal vision
Environmental Science & Policy
A new study found that “a dynamic relationship with nature is a constitutional right” for citizens of only four out of 193 countries with constitutions in force: Ecuador, Bolivia, the Philippines and São Tomé and Príncipe. The authors reviewed national constitutions and environmental and biodiversity policies to understand whether they aligned with the Kunming-Montreal Global Biodiversity Framework’s vision of “a world living in harmony with nature by 2050”. They argued that while such harmony “has little scope for translation into rational or achievable policy”, it is consistent with legislation that has been increasingly recognising the rights of nature. They concluded by calling on politicians to “shift Earth-centred governance from an aspirational party-political issue to a foundational principle through constitutional reforms with policy implications”.
In the diary
- 16-19 January: 60th Session of the Intergovernmental Panel on Climate Change | Istanbul, Turkey
- 23 January: UN Convention on Biological Diversity first meeting of the informal advisory group on benefit-sharing from the use of digital sequence information on genetic resources | Online
- 28 January: Finland presidential election
- 2 February: World wetlands day
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 17 January 2024: Norway’s deep-sea disquiet; Panama drought; New species discovered appeared first on Carbon Brief.
Cropped 17 January 2024: Norway’s deep-sea disquiet; Panama drought; New species discovered
Climate Change
Panama environment minister backs calls for reform of UN climate process
Panama’s environment minister has joined a growing push for reform of the UN climate change negotiations, proposed by campaigners and academics in recent years – one of the first such calls by a minister directly involved in the talks.
Juan Carlos Navarro told Climate Home in a recent interview on the sidelines of Climate Week in New York that the current system for approving decisions – which requires all countries to agree by consensus – has not delivered good enough results and should instead use a majority or super-majority decision-making process.
“By consensus, you cannot get 186 nations to agree on anything. It’s a miracle we have come so far,” said Navarro. “We need to change the rules so we have a basic, rational, majority or super-majority decision-making process where we can do things better and faster.”
The comments follow pressure from civil society and academics to reform the UN climate process. In June, more than 200 campaign groups issued a joint call to reform the decision-making process, which they argued can be blocked by oil and gas-producing countries and has reached a “breaking point”.
Andreas Sieber, policy director with climate advocacy group 350.org, said he was sympathetic to Panama’s proposal, but added “it would just be part of a puzzle” to make the UN climate talks work more efficiently.
He added that it could be hard to get over the line as earlier efforts to secure a rule on voting as a last resort had met with fierce opposition from oil-producing countries – and decisions reached by consensus have the weight of having all the countries behind them, he noted.
Erika Lennon, Senior Attorney at the Center for International Environmental Law, celebrated that more people are talking about potential changes to the UNFCCC, as “being totally beholden to consensus-based decision making is not leading to the outcomes that we need”.
She also agreed that voting is just part of the solution, and suggested possible reforms could include increased transparency in the negotiation rooms, inclusion of civil society and indigenous groups, and a conflict of interest rule that blocks fossil fuel companies from participating.
During last year’s COP29 in Baku, a group of experts known as the Club of Rome – among them the former UN climate chief Christiana Figueres and former UN Secretary-General Ban Ki Moon – issued an open letter proposing ways to modernise the climate process.
The current structure of COPs “simply cannot deliver the change at exponential speed and scale, which is essential to ensure a safe climate landing for humanity”, the letter said. They argued instead for “smaller, more frequent, solution-driven meetings” where countries can discuss progress and be held accountable.
At that same COP in Azerbaijan, Saudi Arabia managed to block all mentions of fossil fuels in text summarising discussions on cutting greenhouse gas emissions. It was able to do this despite all countries having agreed to transition away from fossil fuels in energy systems just one year earlier at COP28.
UN Climate Change consults on COP process
In a speech at Climate Week in New York, Simon Stiell, the executive secretary of UN Climate Change, noted that recent COPs have delivered “concrete results and global steps forward”, adding that cooperation under the process has lowered expected global warming from 5C to closer to 3C.
But, he conceded, it is “imperfect”. “As this new era of implementation gathers pace, we must also keep evolving, and striving towards faster, fully-inclusive, higher-quality decisions that tie the formal process ever-closer to real economies and real lives,” he said.
Senior experts have been asked to examine how the UN climate process could be improved and will deliver their ideas to Stiell later this year. The secretariat will consult with countries on any potential reforms it wants to pursue in 2026, the UN’s climate chief added.
Brazil, the host country of this year’s COP, has put the focus on global mobilisation to implement in practice what governments signed up to in the 2015 Paris Agreement. Last year it proposed setting up a UN Climate Change Council in order to support that work, but this proposal does not seem to have gained much traction amid geopolitical tensions and Trump’s attacks on multilateral climate action.

Downsizing COPs?
Panama’s Navarro added that the UN climate summit has grown too big, making its scope “ridiculous”. In 2023, over 83,000 people attended COP28 in Dubai, while COP29 in Baku saw fewer, with 66,778 registered participants.
Navarro said the COP meetings had become an anachronism. “You have thousands and thousands of people who are living off the story,” he said. “They’re living off these meetings, just sitting around the world on expense accounts, creating a bigger carbon footprint for the planet, and we’re not achieving anything.”
In April 2024, UNFCCC head Stiell said personally he “would certainly like to see future COPs reduce in size”, telling an audience at London’s Chatham House think-tank that “bigger doesn’t necessarily mean better”.
This year, COP30 will be held in the Amazon city of Belem, which poses “self-evident” financial and logistical limitations, according to Navarro, who praised Brazil for being open to hearing the complaints from the Global South countries on this topic.
After many delegations complained over the high costs of accommodation and difficult access, Brazil offered cruise-ship rooms and price caps, and the UN has increased the daily subsidy for diplomats from most developing nations to attend the summit.
Landmark ICJ climate ruling must be turned into concrete action on shipping
‘Less hypocrisy, more concrete results’
“Having said that, and coming back to the point of what COPs have become, I wish that COPs were less bullshit, more concrete results,” Navarro told Climate Home.
His own country – which is judged to be carbon-negative, thanks to its extensive carbon-storing forests – recently published its “Nature Pledge”, combining climate, biodiversity and conservation pledges. Those include restoring 100,000 hectares of ecosystems such as degraded mangroves by 2035, maintaining 30% of Panama’s land and seas under protection and absorbing 5 million tons of CO₂.
Practical measures to achieve that include new equipment for park rangers, more radars to monitor and catch illegal fishing, and fines for polluting industries.
Panama has also set up a Nature Fund, which aims to collect $150 million-$200 million for conservation projects using resources like blue carbon bonds, debt-for-nature swaps and a national carbon market backed by blockchain with revenues going to the public sector to ensure “transparency and accountability”.
Without specifying which, Navarro called out “countries that do an incredible job of greenwashing, talking about conservation and talking about the environment – and they’re either oil producers or plastics producers, or kill whales or are destroying our fisheries, or keep building coal power plants or keep polluting”.
“We’ve run out of time for all of these hypocritical individuals, corporations – or even nations,” he added.
The post Panama environment minister backs calls for reform of UN climate process appeared first on Climate Home News.
Panama environment minister backs calls for reform of UN climate process
Climate Change
AI and satellite data help researchers map world’s transition minerals rush
Researchers are using satellite images and AI-powered modelling to map global mining activity, seeking to plug gaps in existing data as the rush for “transition minerals” fuels concerns about the industry’s impact on the environment and local communities.
Countries are scrambling to shore up supplies of metals vital for the transition to renewables, such as lithium used in electric vehicle (EV) batteries, and copper – used in solar panels and wind turbines, many of which are produced in environmentally sensitive areas.
“New mines will likely be in areas of high biodiversity, or where water and Indigenous rights are at stake,” project lead Victor Maus from the Vienna University of Economics and Business told Climate Home News.
More than half of energy transition mineral resources are located on or near the lands of Indigenous peoples and subsistence farmers, according to a 2022 study published in the Nature journal.
“Monitoring those impacts is critical,” said Maus, whose team members have identified massive gaps in current data when it comes to what, how and even where minerals are being extracted around the world.
During a previous project, they compared global satellite imagery of 120,000 square kilometres of visible mine footprints with the S&P Capital IQ Pro database of mining production. The results were stark. More than half of the mining areas identified from space had no corresponding production data in the official record.
To address these gaps, Maus and his team are building a mining database using satellite images. The project, which is part of the European Union-funded Mine the Gap initiative, will be a vital tool for policymakers and help foster transparency in the mining industry, he added.
“We’re hoping to create not only a research tool but also a means of validating and complementing what companies report, supporting greater transparency across the sector.”
Mapping environmental impact
As well as counting mines and assessing overall production, the database will give a clearer picture about where the biggest environmental and social risks lie by tracking land use around mines, waste generation and signs of environmental degradation.
“Simply knowing how much is being produced isn’t a direct measurement of impact,” said Tim Werner, a senior lecturer at The University of Melbourne who has worked with Maus on previous research into critical minerals.
“We simply don’t have all the information we need to scientifically prove where impacts for one area are worse than others. This is a big problem for strategic environmental management at national and global scales,” he added, describing the data gaps as “mind-boggling”.
A range of satellites are being used to collect the required information, including multispectral imagery, radar and hyperspectral sensors, collected from sources including the EU’s Sentinel constellation and German DLR satellites, chosen for their global coverage and accuracy.
AI will then be used to scan these images, learning how to identify and track potential issues as the project develops.
The challenges of collecting mining data
There have been previous attempts to map the overlap between energy transition mineral mines and key biodiversity hotspots in different mineral-rich countries, as well as industry efforts to plug the gaps in data about global mining production.
But past efforts to map global mining more accurately have struggled to document small-scale and artisanal mining operations, which are often unregulated despite their significant social and environmental impacts.
In September, the International Council on Mining and Metals (ICMM) launched its global mining database – reportedly the most comprehensive mining resource to date, with information about more than 15,000 active facilities in 151 countries, but it does not include informal mining sites.
“We had to draw some scope boundaries,” said Emma Gagen, the ICMM’s data and research director. “The industry is huge and that’s been the challenge this whole time – people haven’t tried to collect this data before because it’s so vast.”
The case for clearer global standards
Despite such data initiatives, which reflect growing pressure on the industry to clean up its act, researchers say structural and legislative changes will be needed to reduce the harms caused by mining.
Gagen said more uniform regulatory standards would “drive performance improvements across the industry.”
“What’s most needed is alignment,” Maus said. “Clearer global standards on what should be measured and reported, and policies that encourage disclosure of mining data.”
For Maus and his team, having an accurate picture is a crucial first step.
“If we don’t even know how many materials are being produced, we’ve got very little basis to even understand the scale of possible impacts in an area,” Werner said.
Main image: Satellite image showing the expansion of nickel mining in Sulawesi, Indonesia (Photo: Sentinel-2 cloudless by EOX IT Services GmbH, which contains modified Copernicus Sentinel data 2024)
The post AI and satellite data help researchers map world’s transition minerals rush appeared first on Climate Home News.
AI and satellite data help researchers map world’s transition minerals rush
Climate Change
Experts: The key ‘unknowns’ of overshooting the 1.5C global-warming limit
Last week, around 180 scientists, researchers and legal experts gathered in Laxenburg, Austria to attend the first-ever international conference focused on the controversial topic of climate “overshoot”.
This hypothesised scenario would see global temperatures initially “overshoot” the Paris Agreement’s aspirational limit of 1.5C, before they are brought back down through techniques that would remove carbon dioxide from the atmosphere.
(For more on the key talking points, new research and discussions that emerged from the three-day conference, see Carbon Brief’s full write-up of the event.)
On the sidelines of the conference, Carbon Brief asked a range of delegates what they consider to be the key “unknowns” around overshoot.
Below are their responses, first as sample quotes, then, in full:
- Dr James Fletcher: “Yes, there will be overshoot, but at what point will that overshoot peak? Are we peaking at 1.6C, 1.7C, 2.1C?”
- Prof Shobha Maharaj: “There are lots of places in the world where adaptation plans have been made to a 1.5C ceiling. The fact is that these plans are going to need to be modified or probably redeveloped.”
- Sir Prof Jim Skea: “There are huge knowledge gaps around overshoot and carbon dioxide removal.”
- Prof Kristie Ebi: “If there is going to be a peak – and, of course, we don’t know what that peak is – then how do you start planning?”
- Prof Lavanya Rajamani: “To me, a key governance unknown is the extent to which our current legal and regulatory architecture…will actually be responsive to the needs of an overshoot world.”
- Prof Nebojsa Nakicenovic: “One of my major concerns has been for a long time…is whether, even after reaching net-zero, negative emissions can actually produce a temperature decline.”
- Prof Debra Roberts: “For me, the big unknown is how all of these areas of increased impact and risk actually intersect with one another and what that means in the real world.”
- Prof Oliver Geden: “[A key unknown] is whether countries are really willing to commit to net-negative trajectories.”
- Dr Carl-Friedrich Schleussner: “This is a bigger concern that I have – that we are pushing the habitability in our societies on this planet above that limit and towards maybe existential limits.”
- Dr Anna Pirani: “I think that tracking global mean surface temperature on an overshoot pathway will be an important unknown.”
- Prof Richard Betts: “One of the key unknowns is are we going to continue to get the land carbon sink that the models produce.”
- Prof Hannah Daly: “The biggest unknown is whether countries can translate these global [overshoot] pathways into sustained domestic action…that is politically and socially feasible.”
- Dr Andrew King: “[W]e still have a lot of uncertainty around other elements in the climate system that relate more to what people actually live through.”
Former minister for public service, sustainable development, energy, science and technology for Saint Lucia and negotiator at COP21 in Paris.
The key unknown is where we’re going to land. At what point will we peak [temperatures] before we start going down, and how long will we stay in that overshoot period? That is a scary thing. Yes, there will be overshoot, but at what point will that overshoot peak? Are we peaking at 1.6C, 1.7C, 2.1C? All of these are scary scenarios for small island developing states – anything above 1.5C is scary. Every fraction of a degree matters to us. Where we peak is very important and how long we stay in this overshoot period is equally important. That’s when you start getting into very serious, irreversible impacts and tipping points.
Adjunct professor at the University of Fiji and a coordinating lead author for Working Group II of the IPCC’s seventh assessment
First of all, there is an assumption that we’re going to go back down from overshoot. Back down is not a given. And secondly, we are still in the phase where we are talking about uncertainty. Climate scientists don’t like uncertainty. We are not acknowledging that uncertainty is the new normal… But because we’re so bogged down in terms of uncertainties, we are not moving towards [the issue of] what we do about it. We know it’s coming. We know the temperatures are going to be high. But there is little talk about the action.
The focus seems to be more on how we can understand this or how we can model this, but not what we do on the ground. Especially when it comes to adaptation planning – [and around] how does this modify whatever the plans are? There are lots of places in the world where adaptation plans have been made to a 1.5C ceiling. The fact is that these plans are going to need to be modified or probably redeveloped. And no one is talking about this, especially in the areas that are least resourced in the world – which sets up a big, big problem.
Chair of the Intergovernmental Panel on Climate Change (IPCC) and emeritus professor at Imperial College London’s Centre for Environmental Policy
There are huge knowledge gaps around overshoot and carbon dioxide removal. As it’s very clear from the themes of this conference, we don’t altogether understand how the Earth would react in taking carbon dioxide out of the atmosphere. We don’t understand the nature of the irreversibilities and we don’t understand the effectiveness of CDR techniques, which might themselves be influenced by the level of global warming, plus all the equity and sustainability issues surrounding using CDR techniques.
Professor of global health at the University of Washington‘s Center for Health and the Global Environment
There are all kinds of questions about adaptation and how to approach effective adaptation. At the moment, adaptation is primarily assuming a continual increase in global mean surface temperature. If there is going to be a peak – and of course, we don’t know what that peak is – then how do you start planning? Do you change your planning? There are places, for instance when thinking about hard infrastructure, [where overshoot] may result in a change in your plan – because as you come down the backside, maybe the need would be less. For example, when building a bridge taller. And when implementing early warning systems, how do you take into account that there will be a peak and ultimately a decline? There is almost no work in that. I would say that’s one of the critical unknowns.
Professor of international environmental law at the University of Oxford
I think there are several scientific unknowns, but I would like to focus on the governance unknowns with respect to overshoot. To me, a key governance unknown is the extent to which our current legal and regulatory architecture – across levels of governance, so domestic, regional and international – will actually be responsive to the needs of an overshoot world and the consequences of actually not having regulatory and governance architectures in place to address overshoot.
Distinguished emeritus research scholar at the International Institute for Applied Systems Analysis and executive director of The World In 2050.
One of my major concerns has been for a long time – as it was clear that we are heading for an overshoot, as we are not reducing the emissions in time – is whether, even after reaching net-zero, negative emissions can actually produce a temperature decline…In other words, there might be asymmetry on the way down [in the global-temperature response to carbon removal] – it might not be symmetrical to the way up [as temperature rise in response to carbon emissions]. And this is really my major concern, that we are planning measures that are so uncertain that we don’t know whether they will reach the goal.
The last point I want to make is that I think that the scientific community should, under all conditions, make sure that the highest priority is on mitigation.
Honorary professor at the University of KwaZulu-Natal, coordinating lead author on the IPCC’s forthcoming special report on climate change and cities, board chair of the Red Cross Red Crescent Climate Centre and co-chair of Working Group II for the IPCC’s sixth assessment
Well, I think coming from the policy and practitioner community, what I’m hearing a lot about are the potential impacts that come from the exceedance component of overshoot. What I’m not hearing a lot about is the responses to overshoot and their impacts – and how those impacts might interact with the impacts from temperature exceedance. So there’s quite a complex risk landscape emerging. It’s three dimensional in many ways, but we’re only talking about one dimension and, for policymakers, we need to understand that three dimensional element in order to understand what options remain on the table. For me, the big unknown is how all of these areas of increased impact and risk actually intersect with one another and what that means in the real world.
Senior fellow and head of the climate policy and politics research cluster at the German Institute for International and Security Affairs and vice-chair of IPCC Working Group III
[A key unknown] is whether countries are really willing to commit to net-negative trajectories. We are assuming, in science, global pathways going net negative, with hardly any country saying they want to go there. So maybe it is just an academic thought experiment. So we don’t know yet if [overshoot] is even relevant. It is relevant in the sense that if we do, [the] 1.5C [target] stays on the table. But I think the next phase needs to be that countries – or the UNFCCC as a whole – needs to decide what they want to do.
Research group leader and senior research scholar at the International Institute for Applied Systems Analysis
I’m convinced that there’s an upper limit of overshoot that we can afford – and it might be not far outside the Paris range [1.5C-2C] – before human societies will be overwhelmed with the task of bringing temperatures back down again. This [societal limit] is lower than the geophysical limits or the CDR limit.
The impacts of climate change and the challenges that will come with it will undermine society’s abilities to cooperatively engage in what is required to achieve long-term temperature reversal. This is a bigger concern that I have – that we are pushing the habitability in our societies on this planet above that limit and towards maybe existential limits. We may not be able to walk back from it, even if we wanted to. That is a big unknown to me.
I’m convinced that there is an upper limit to how much overshoot we can afford, and it might be just about 2C or a bit above – it might not be much more than that. But we do not have good evidence for this. But I think these scenarios of going to 3C and then assuming we can go back down – I have doubts that future societies grappling with the impacts of climate change will be in the position to embark on such an endeavour.
Senior research associate at the Euro-Mediterranean Center on Climate Change (CMCC) and former head of the Technical Support Unit for Working Group I of the IPCC
I think that tracking global mean surface temperature on an overshoot pathway will be an important unknown – how to take account of natural variability in that context, to inform where we are on an overshoot pathway and how well we’re doing on it. I think, methodologically, that would prove to be a challenge. The fact that it occurs over many, many years – many decades – and, yet, we sort of think about it as a nice curve. We see these graphs that say “by the 2050s, we will be here and we’ll start declining and so on”. I think that what that actually translates to in the evolution of global surface temperatures is going to be very difficult to measure and track. Even how we report on that, internationally, in the UNFCCC [UN Framework Convention on Climate Change] context and what the WMO [World Meteorological Organization] does in terms of reporting an overshoot trajectory, that would be quite a challenge.
Head of climate impacts research in the Met Office Hadley Centre and professor at the University of Exeter
One of the key unknowns is are we going to continue to get the land carbon sink that the models produce. We have got model simulations of returning from an overshoot.
If you are lowering temperatures, you have got to reduce emissions. The amount you reduce emissions depends on how much carbon is taken up naturally by the system – by forests, oceans and so on. The models will do this; they give you an answer. But we don’t know whether they are doing the right thing. They have never been tested in this kind of situation.
In my field of expertise, one of the key [unknowns] is how these carbon sinks are going to behave in the future. That is why we are trying to get real-world data into the models – including through the Amazon FACE project – so we can really try and narrow the uncertainties in future carbon sinks. If the carbon sinks are weaker than the models think, it is going to be even harder to reduce emissions and we will need to remove even more by carbon capture and removal.
Professor of sustainable energy at University College Cork
We know ever more about the profound – and often irreversible – damages that will be felt as we overshoot 1.5C. Yet we seem no closer to understanding what will unlock the urgent decarbonisation that remains our only way to avoid the worst impacts of climate change.
Global models can show, on paper, what returning temperatures to safer levels after overshoot might look like. The biggest unknown is whether countries can translate these global pathways into sustained domestic action – over decades and without precedent in history – that is politically and socially feasible.
Associate professor in climate science at the University of Melbourne
I think, firstly, can we actually achieve net-negative emissions to bring temperatures down past a peak? It’s a completely different world and, unfortunately, it’s likely to be challenging and we’re setting ourselves up to need to do it more. So I think that’s a huge unknown.
But then, beyond that, I think also, whilst we’ve built some understanding of how global temperature would respond to net-zero or net-negative emissions, we still have a lot of uncertainty around other elements in the climate system that relate more to what people actually live through. In our warming world, we’ve seen that global warming relates to local warming being experienced by everyone at different amounts. But, in an overshoot climate, we would see quite diverse changes for different people, different areas of the world, experiencing very different changes in our local climates. And also definitely worsening of some climate hazards and possibly reversibility in others, so a very different risk landscape as well, emerging post net-zero – and I think we still don’t know very much about that as well.
The post Experts: The key ‘unknowns’ of overshooting the 1.5C global-warming limit appeared first on Carbon Brief.
Experts: The key ‘unknowns’ of overshooting the 1.5C global-warming limit
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