Last week, hundreds of scientists, policymakers and journalists flocked to the University of Exeter to attend an international conference on “tipping points”.
The conference saw experts discussing the dangers of a range of Earth system tipping points, including the dieback of the Amazon, the melting of the Greenland ice sheet and the shutdown of the Atlantic Meridional Overturning Circulation (AMOC).
Attendees also explored “positive tipping points” – large-scale, self-propelling social changes that would reduce the impact of humans on the climate.
(For more on the key talking points, new research and ideas that emerged from the four-day event, see Carbon Brief’s full write-up of the event.)
On the sidelines of the conference, Carbon Brief asked a wide range of delegates which tipping point concerns them the most.
These are their responses, first as sample quotes, then, below, in full:
- Prof Gabi Hegerl: “I am particularly worried about tipping points that involve the biosphere and humans due to breaching thresholds for heat or drought that then ripple into food availability, livelihood and ecosystems.”
- Prof Carlos Nobre: “The Amazon is a very serious tipping point, because [dieback] could release around 250bn tonnes of CO2 by 2100 – which will make it impossible to [limit global warming] at 1.5C.”
- Gaia Vince: “I would say that we have already passed the tipping point for coral reef ecosystems…As a scuba diver, I find it a tragedy because I love coral reef ecosystems, but it’s also a tragedy for human systems.”
- Dr Andrew Hartley: “The tipping point I’m most concerned about is Amazon forest dieback…because of the significance of the carbon cycle and the feedback to the global climate. Also [due to] the effects that Amazon tipping has on food security, both locally and globally.”
- Prof Tim Lenton: “The Atlantic Meridional Overturning Circulation, or AMOC, for sure. The consequences of crashing that would be devastating globally – and also for where I live in the UK.”
- Prof Peter Cox: “The one that I’ve worked on most and worries me most at the moment is Amazon dieback. And that’s because we’ve got two things, two stressors, going on at once that push it in the wrong direction. Climate change is one, deforestation is another.”
- Prof Johan Rockström: “The tipping element that worries me most is coral reef systems, for the simple reason that the scientific uncertainty range is very limited.”
- Dr Patricia Pinho: “For me, it is the Amazon…I think it’s going to be a really profound, irreversible change that will affect the global population in the most dramatic way.”
- Prof Ricarda Winkelmann: “I’m mostly concerned about the Greenland and West Antarctic ice sheets. This is because we know that, even at lower warming levels, they are already at risk of transgressing tipping points in certain regions.”
- Dr Nico Wunderling: “The tipping element that worries me most is the Amazon rainforest. This is because the Amazon rainforest is not only threatened by climate change, but also by deforestation at the same time.”
- Dr Rebecca Shaw: “The coral reef tipping point…It signals the end of the most colourful and biodiverse ecosystem which supports the nutrition and livelihoods of over one billion people.”
- Dr David Obura: “The ice [tipping elements] – because they are the first ones to go that have cascading impacts on other tipping elements.”
- Dr David Armstrong McKay: “The Amazon is actually probably closer to a deforestation-induced tipping point than to a climate change-induced tipping point. So, I actually think that could be potentially in the offing sooner than we would like.”
- Kate Raworth: “The tipping point that I fear we will fail to cross is [the social tipping point] around transforming our mindsets.”
Chair in climate system science in the school of geosciences at the University of Edinburgh
I am worried about all of them, but for the immediate future, I am particularly worried about tipping points that involve the biosphere and humans due to breaching thresholds for heat or drought that then ripple into food availability, livelihood and ecosystems. The Earth system tipping points will do that too, but maybe a little bit later. Examples [of this] are the coral diebacks triggered by marine heatwaves, forest change and fires, and droughts threatening livelihoods and putting people on the move.
I did a research project on the US Dust Bowl and the trigger [for that event] was drought causing vegetation and crop dieback, [which led to] extreme heat and dust storms in response – and migration, as memorialised in [the 1939 John Steinbeck novel] The Grapes of Wrath. And, now with warming, all droughts get supercharged.
Prof Carlos Nobre
Scientist and meteorologist who spearheaded the multi-disciplinary, multinational large-scale biosphere-atmosphere experiment in Amazonia
The Amazon is a very serious tipping point, because [dieback] could release around 250bn tonnes of CO2 by 2100 – which will make it impossible to [limit global warming] at 1.5C. We could also lose the largest [host to] biodiversity on the planet, which would induce a tremendous, large number of epidemics and several pandemics. Also, of course, the Amazon forest controls aspects of the global climate. In South America, the climate is entirely controlled by the Amazon forest.
I’m most worried about Amazon [dieback] because I have worked on it for 40 years. But the other tipping points deeply concern me. The melting of the permafrost will release more than 200bn tonnes [of greenhouse gases], mostly methane. Ice sheet melt in Greenland is a very serious tipping point because it could raise sea level rise by three metres in 200 years. The melting of Greenland has already started. Species extinction is also very serious.
One thing that was not much talked about [at this conference] is that when the ocean heats up, particularly the Arctic Ocean, then a tremendous amount of methane is released. And if that happens – if the Arctic Ocean warms up by 3-4C – the amount of methane that would be released could see [air] temperatures reach 8-10C [above pre-industrial levels]. At 8-10C, the only inhabitable places for us humans will be the top of the Alps, the Andes and the north and south poles. The rest of the planet would be uninhabitable.
Gaia Vince
Science writer and broadcaster
I would say that we have already passed the tipping point for coral reef ecosystems, for example. That really is a tragedy. As a scuba diver, I find it a tragedy because I love coral reef ecosystems, but it’s also a tragedy for human systems. They are the nursery for our fisheries. And, of course, they’re not just fisheries – they are a valid ecosystem and a biodiversity hotspot. This will have untold consequences and cascading impacts for other parts of the ecosystem, for example, the cycling of nutrients and coral reefs are really important to stop coastal erosion. And they actually provide sand, the lovely white sand that people go on holiday for Bucha.
Dr Andrew Hartley
Climate impacts scientist at the Met Office Hadley Centre
The tipping point I’m most concerned about is Amazon forest dieback and reduction in the function of the Amazon forest, because of the significance of the carbon cycle and the feedback to the global climate. Also [due to] the effects that Amazon tipping has on food security, both locally and globally, because of [the Amazon’s] contribution to major commodity markets, such as soybean and maize.
This might interact with climate change in the future to lead to more severe events, particularly in populated areas of Brazil. If an Amazon tipping point were to occur, it might lead to more severe events on the coast of Brazil which would affect a much larger population. There are negative impacts across the forest from the drying of the forest, for example for the Indigenous communities, but also globally.
Prof Tim Lenton
Founding director of the Global Systems Institute and chair in climate change and Earth system science at the University of Exeter
The Atlantic Meridional Overtoning Circulation, or AMOC, for sure. The consequences of crashing that would be devastating globally – and also for where I live in the UK. By our own calculation, we could have less than half the viable area for growing a couple of major staple crops, wheat and maize worldwide. We would have a widespread water crisis. We could have collapses of the monsoons in West Africa and India that would displace hundreds of millions of people. It is hard to see that as anything other than a catastrophe.
Prof Peter Cox
Professor of climate system dynamics in mathematics and director of the Global Systems Institute at the University of Exeter
The one that I have worked on most and worries me most at the moment is Amazon dieback. And that’s because we’ve got two things, two stressors going on at once that push it in the wrong direction. Climate change is one, deforestation is another. You can imagine crossing the boundary in various ways – but, if you push diagonally, you get there quicker.
If I had spoken to you 25 years ago, I would have said I’m really worried about [Amazon dieback]. Then I went through a phase of thinking that the models have overdone it. And now I’m thinking the models that don’t include land-use change are underdoing it. So, I’m more concerned about that one.
There are others as well, but that is the one that is also quite fast. The other [tipping points] we worry about, we’re worried about a long-term commitment. It takes a while for the AMOC to shut down, it really does. It takes a while for the Greenland ice sheet to melt. We’ve done work that suggests you can overshoot even a little bit for these slow systems. The Amazon forest is a decadal dieback, especially if it is fire driven.
Prof Johan Rockström
Director of the Potsdam Institute for Climate Impact Research (PIK) and professor in Earth system science at the University of Potsdam
There is not a simple answer to this – there is a two-part answer.
The tipping element that worries me most is coral reef systems, for the simple reason that the scientific uncertainty range is very limited. We have, unfortunately, ample evidence that at 1.5C we’re very likely to knock over, potentially, the entire tropical coral reef system on Earth. [This threatens] the livelihoods of 400 million people and a fundamental nursing ground for the whole ocean food web. So that is one deep concern. It is the canary in the coal mine – the first kid on the block to fall over. We’re so close.
The second one is AMOC – the whole overturning of heat in the Atlantic, which connects the entire ocean system. Not only is the latest science showing that we are going from low likelihood to uncomfortably high likelihood, but we also know – with very little uncertainty – that this would cause a catastrophic impact across the entire world, and it would go fast. So the AMOC, I would argue, is today the most important scientific message to the world. If you want a really hard-hitting reason to act at a level of planetary emergency, it is the AMOC. That is the second one.
From a planetary boundary perspective, it is important to recognise that – on climate science grounds – the Amazon basin is not at risk of tipping until 3-5C of warming. But as soon as you factor in loss of biodiversity, deforestation and changes in hydrology – then the temperature risk goes down to between 1.5-2C. So suddenly – when taking a more integrated [assessment] approach – the conclusion is that it is also very close to a tipping point.
Dr Patricia Pinho
Deputy science director at the Amazon Environmental Research Institute (IPAM)
For me, it is the Amazon. When we think of the planetary crisis, we think about the Amazon and all the regulating climate services it provides. This is not only regionally, but we know it’s a global “climate good”, if you will. But it is highly sensitive to land-use change and increasing temperature. So, if we transition to a point of no return – Amazon dieback – and transforming or transitioning to another ecosystem, the function of the forest will not be doing what it has been doing for the past millennium and so on. And then we cannot revert this loss. I think it is going to be a really profound, irreversible change that will affect the global population in the most dramatic way.
Of course, we have the people on the front line that I’m working with – Indigenous people, traditional population – that are safeguarding this resource, but they are also at the front line of climate risks and the impacts that we already observe. If we miss this opportunity of really reverting from increasing greenhouse emissions and increasing temperature, we’re going to miss the window of opportunity to really protect the region, protect the ecosystem and the forest for the global society.
Prof Ricarda Winkelmann
Founding director of the Max Planck Institute of Geoanthropology and professor of climate system analysis at PIK and the University of Potsdam
So I am thinking about this from a risk perspective – so both the likelihood as well as the impacts – and I think the answer depends on that. Because when it comes to the likelihood and the particular threshold – and we know about those – I’m mostly concerned about the Greenland and the West Antarctic ice sheets. This is because we know that, even at lower warming levels, they’re already at risk of transgressing tipping points in certain regions.
But when it comes to the impacts and also the timescales over which those play out, there are other tipping elements that worry me most. In particular, regional tipping elements. So if we think of the mountain glaciers, for instance, these impacts are already experienced right now and several mountain glaciers are undergoing these accelerated changes. And so thinking about the timescales when it comes to the impacts is also incredibly important.
Dr Nico Wunderling
Junior professor at the Center for Critical Computational Studies at Goethe University Frankfurt and researcher at the Potsdam Institute for Climate Impact Research.
The tipping element that worries me most is the Amazon rainforest. This is because the Amazon rainforest is not only threatened by climate change, but also by deforestation at the same time. So that means that the critical threshold from climate change alone, at around 3-4C of global warming, can come down to 1.5-2C. Climate change and deforestation basically go hand-in-hand to lower the [Amazon’s tipping] threshold because of this double threat.
Dr Rebecca Shaw
Chief scientist and senior vice-president at WWF
The coral reef tipping point – it comes first because of warming surface waters, and then the outcome is sealed by ocean acidification. It signals the end of the most colourful and biodiverse ecosystem which supports the nutrition and livelihoods of over one billion people and has captured the imagination of more people than any other through the characters like Nemo the clownfish, SpongeBob SquarePants, and, of course, Frank the coral [a character from an educational YouTube video].
If humanity is not motivated to act in the face of the loss of coral reefs, is there hope that we will act in time to prevent the Amazon and glacier tipping points?
Dr David Obura
Chair of the Intergovernmental Science-Policy Platform on Biodiversity and Ecosystem Services and founding director of CORDIO East Africa
The ice [tipping elements] – because they are the first ones to go that have cascading impacts on other tipping elements. When [ice masses] reduce, we lose their albedo, waters heat up more [and] the AMOC can collapse. That has the biggest impact across the planetary system, including the Amazon.
My own [research], of course, is coral reefs. So, in a way, the coral reef tipping point does concern me the most. [But] it doesn’t have cascading impacts on other tipping elements. It does on people, in socioeconomic terms – but not on other system elements. So, in a sense, it is the least worrying one.
Dr David Armstrong McKay
Lecturer in geography, climate change and society in the school of global studies at the University of Sussex and lead author on an influential tipping points assessment, published in Science in 2022
One of the tipping systems that concerns me the most is Amazon rainforest dieback. Because even though we assessed it a few years ago as having a warming threshold that’s a bit higher than what we might be seeing – we’ve thought it is maybe at a best estimate of 3.5C – there’s also deforestation as well. The Amazon is actually probably closer to a deforestation-induced tipping point than to a climate change-induced tipping point. So I actually think that could be potentially in the offing sooner than we would like. That would have huge impacts for biodiversity, for South America as a whole, by shifting rainfall patterns, which would really affect a lot of people for agriculture or ecosystems. Also, the Amazon as an ecosystem is so incredibly biodiverse and amazing in itself, it would be a tragedy to lose it.
Kate Raworth
Senior visiting research associate and lecturer at the University of Oxford’s Environmental Change Institute and co-founder and conceptual lead of Doughnut Economics Action Lab
The tipping point that I fear we will fail to cross is [the social tipping point] around transforming our mindsets. We need to move from the extractive, degenerative economy towards a regenerative one. This all starts within our head and it underlies everything.
[A failure to do this] is what is driving us towards all these [Earth system tipping points].
The post Experts: Which climate tipping point is the most concerning? appeared first on Carbon Brief.
Experts: Which climate tipping point is the most concerning?
Climate Change
DeBriefed 20 March 2026: Energy crisis deepens | Brazil’s new climate plan | New Zealand climate case
Welcome to Carbon Brief’s DeBriefed.
An essential guide to the week’s key developments relating to climate change.
This week
Iran war fallout continues
WORK FROM HOME: The International Energy Agency has advised its member countries to take 10 steps in response to the ongoing energy crisis fuelled by the Iran war, including reducing highway speeds and encouraging people to work from home, said the Guardian. It came after retaliatory attacks between Israel and Iran continued to destroy energy infrastructure in the Middle East, causing energy prices to soar further, said Reuters.
SUPPLY DISRUPTED: The IEA also said it is prepared to make more of its member nations’ 1.4bn-barrel oil reserves available to help ease the impacts of what it called the “biggest supply disruption in the history of the oil market”, reported Bloomberg. The outlet noted that Asian countries have been hit hardest by the shortages, caused by a “near-halt” of shipping through the Strait of Hormuz.
EU SUMMIT: The energy crisis dominated talks at an EU leaders summit on Thursday, said Politico. Arriving at the summit, Spain’s prime minister Pedro Sánchez attacked other European leaders for using the energy crisis as an excuse to “gut climate policies”, according to the EU Observer. The Financial Times said that some European leaders have asked the European Commission to overhaul its flagship emissions trading system (ETS) by summer in response to the energy crisis.
COAL BOOST: In response to the conflict, utility companies in Asia are “boosting coal-fired power generation to cut costs and safeguard energy supply”, said Reuters. UN climate change executive secretary Simon Stiell told Reuters: “If there was ever a moment to accelerate that energy transition, breaking dependencies which have shackled economies, this is the time.”
Around the world
- WINDFARM WINDFALL: The Trump administration in the US is considering a nearly $1bn settlement with TotalEnergies to cancel the French energy company’s two planned windfarms off the US east coast and have it instead invest in fossil-gas infrastructure in Texas, according to documents seen by the New York Times.
- BUSINESS CLASH: Following “clashes” with the agribusiness sector, Brazil launched its new climate plan, which calls for a 49-58% reduction in greenhouse gas emissions from 2022 levels by 2025 and includes “specific guidelines for different sectors”, reported Folha de Sao Paolo.
- SALES SLUMP: Sales of liquified petroleum gas from India’s state-run oil companies have fallen by 17% this month due to cuts in deliveries to commercial and industrial consumers “amid the widespread logistical bottlenecks triggered by the Iran war”, said the Economic Times.
- CUBAN ENERGY CRISIS: The US imposed an “effective oil blockade” on Cuba, leaving the country facing its “worst energy crisis in decades”, reported the Washington Post. Meanwhile, Chinese exports of solar panels to the island have “skyrocketed” since 2023, it added.
- RECORD HIGHS: An “unprecedented” heatwave in the western and south-western US is “shattering dozens of temperature records” and could lead to drought in California in the coming months, reported the Los Angeles Times.
- VULNERABILITY CONCERNS: Landslides that killed more than 100 people in southern Ethiopia have “renewed concerns about Ethiopia’s vulnerability to climate-related disasters”, said the Addis Standard.
1%
The percentage of England’s land surface that could be devoted to renewables by 2050, according to the long-awaited “land-use framework” released by the UK government this week and covered by Carbon Brief.
Latest climate research
- Approaching international climate action by shifting the burden of mitigation onto higher-income countries could avoid 13.5 million premature deaths from air pollution in middle- and lower-income countries by 2050 | The Lancet Global Health
- Beavers can turn the ecosystems surrounding streams into “persistent” sinks of carbon that can sequester an order of magnitude more than non-beaver-modified ecosystems can store | Communications Earth & Environment
- Mobile-phone data from seven diverse countries during the summer heatwaves of 2022-23 showed a “widespread tendency to withdraw into homes” and an increase in out-of-home activities that can offer cooling, such as indoor retail | Environmental Research: Climate
(For more, see Carbon Brief’s in-depth daily summaries of the top climate news stories on Monday, Tuesday, Wednesday, Thursday and Friday.)
Captured
Carbon Brief this week published a significant update to its map of how climate change is affecting extreme weather events around the world. The map now includes 232 new extreme weather events from studies published in 2024 and 2025. Of these events, 196 were made more severe or more likely to occur by human-driven climate change, 12 were made less severe or less likely to occur and 10 had no discernible human influence. (The remaining 14 studies were inconclusive.)
Spotlight
New Zealand breaks new ground on climate litigation
This week, Carbon Brief speaks to experts about a first-of-its-kind climate lawsuit in New Zealand.
Earlier this week, representatives from two environmentally focused legal advocacy groups challenged the New Zealand government’s climate-action plan in court.
The plaintiffs argued that the measures laid out in the plan are insufficient to achieve the country’s legal obligation to hold global warming to 1.5C above pre-industrial temperatures.
The case could be “influential” in shaping lawsuits and rulings around the world, one legal expert not involved in the case told Carbon Brief.
Reductions vs removals
The new case contends that there are several issues regarding the New Zealand government’s response to climate change.
One of the key arguments the plaintiffs make is that New Zealand’s second emissions reduction plan, which covers the period from 2026-30, is overreliant on the use of tree-planting to achieve its targets.
When the plan was released in December 2024, it was “immediately clear that it was a pretty lacklustre plan”, Eliza Prestidge Oldfield, senior legal researcher at the Environmental Law Initiative, one of the groups behind the legal case, told Carbon Brief.
The plan called for large-scale planting of pine tree plantations, which are not native to New Zealand and have a high risk of burning. Because of this, there are concerns about how permanent any carbon removal provided by these plantations actually can be, experts told Carbon Brief.
Catherine Higham, senior policy fellow at the Grantham Research Institute on Climate Change and the Environment who was not involved in the case, said:
“The lawyers are arguing that there are real challenges with equating the emissions that you may be able to remove from the atmosphere through afforestation with actual emissions reductions, which are much more certain.”
‘Global dialogue’
While other climate lawsuits elsewhere in the world have also focused on the inadequacy of a government’s plan to meet its stated emissions-reduction targets, this is the first such case that addresses the role of removals head-on.
Lucy Maxwell, co-director of the Climate Litigation Network, told Carbon Brief that the lawsuit “builds on a decade of climate litigation” in national, regional and international courts.
Maxwell, who was not involved in the New Zealand case, added that there is a “real global dialogue” between, not just plaintiffs, but national courts as well. She said:
“[National courts] look to common issues that have been decided in other countries. They’re not binding on that court if it’s at the national level, but they are influential.”
Given that many other countries have legal frameworks requiring their governments to create plans outlining the pathway to their long-term climate targets, Prestidge Oldfield told Carbon Brief that other jurisdictions “should be interested in these questions around the level of certainty”.
Higham noted that, even if the case is successful, addressing the plan’s shortfalls will face its own set of challenges. She told Carbon Brief:
“A lot of these decisions are political and they can be politically contentious…Those [measures] have to be put into action through legislation and that is then subject to the usual political process. So that’s where the challenge comes in.”
While she could not speculate on the outcome of the case, Prestidge Oldfield said it was “very heartening” to see that both the judge and the opposing counsel “appreciated how much of a concern climate change is globally”.
She added:
“It’s not a given that the judge would even be interested in climate change.”
Watch, read, listen
COMMON APPROACH: The Heated podcast analysed fossil-fuel advertisements and highlighted the most common deception tactics they employed.
THREAT ASSESSMENT: Mongabay mapped the potential threat that oil extraction poses to Venezuela’s ecosystems, including the Amazon rainforest and its coral reefs.
SALT LAKES? GREAT!: High Country News interviewed journalist Dr Caroline Tracey about her new book on saline lakes – such as Utah’s Great Salt Lake – the threats that face them and what they can teach us.
Coming up
- 23 March-2 April: Third meeting of the preparatory commission for the High Seas Treaty, New York
- 24-27 March: 64th session of the Intergovernmental Panel on Climate Change, Bangkok
- 26-29 March: 14th ministerial conference of the World Trade Organization, Yaoundé, Cameroon
Pick of the jobs
- International Centre of Research for the Environment and Development (CIRAD), IPCC chapter scientist | Salary: €3,200-3,750 per month. Location: Nogent-sur-Marne, France
- Avaaz, chief of staff | Salary: Dependent on location. Location: Remote, with preferred time zones
- Green Party, social media officer | Salary: £31,592-£32,192. Location: Remote or Westminster, UK
DeBriefed is edited by Daisy Dunne. Please send any tips or feedback to debriefed@carbonbrief.org.
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The post DeBriefed 20 March 2026: Energy crisis deepens | Brazil’s new climate plan | New Zealand climate case appeared first on Carbon Brief.
Around 300 scientists, civil servants, journalists and climate experts took part in the 11th annual Carbon Brief quiz on Wednesday 18 March 2026.
For the second time, this year’s quiz was hosted by Octopus Energy at its headquarters in central London.
In total, 39 teams participated – 25 teams in person and 14 teams joining via Zoom.
Competing teams reflected a wide range of climate change and energy professionals. The list included journalists, civil servants, climate campaigners, policy advisers, energy experts and scientists.
Organisations represented included: Council on Energy, Environment and Water (CEEW) in India; New Scientist; the Times; Business Green; the Bartlett School of Environment, Energy and Resources (BSEER), UCL; Verisk Maplecroft; BBC; World Weather Attribution; Grantham Institute at Imperial; DESNZ; WWF; European Climate Foundation (ECF); the ENDS Report; C40 Cities; Ricardo; Met Office; Meliore; E3G; Danish Meteorological Institute (DMI); Energy Transitions Commission; Carbon Tracker; Ember; Royal Meteorological Society; Civil Service Climate and Environment Network (CSCEN); Changing Markets Foundation; Cerulogy; Oxford Sustainable Law Programme; Université de Lausanne; University of Exeter; Centre for Environment and Sustainability, University of Surrey; UK Parliament; Skeptical Science; ECIU (Energy and Climate Intelligence Unit); Octopus Energy; DeSmog; Department for Transport and Royal School of Mines.
Teams were tested with five rounds of questions – general knowledge, policy, science and two picture rounds. (See the slideshow of the questions and answers below).
After two hours of playing, this year’s winners were announced.
Comprised of players from the Council on Energy, Environment and Water (CEEW) in India, last time’s second place team, “Emissions Impossible” won the coveted Carbon Brief trophy with a total score of 76 out of 100 available points.
In joint second place, with 59 points, were the “Potato-sized nodules”, a mixed team of journalists from New Scientist, the Times and Business Green.
Sharing second place, after leading at the half-way point, were “You cannot BSEERious” from the Bartlett School of Environment, Energy and Resources at UCL.
In fourth place, with 57 points, were “Risky Quizness”, from Verisk Maplecroft.
A certificate was awarded to the BBC for the best team name, as voted for by Carbon Brief staff: “High hopes [low confidence]”.
See the full leaderboard:
All the questions and answers from this year’s quiz can be found in this PDF document.
This year’s trickiest round was picture round two, which asked teams to match the quote to the author, with an average score of 5.9 out of 20 available points.
No team correctly guessed that “Chris Funk: Drought, Flood, Fire” was the source of the quote: “How greenhouse gases warm the atmosphere is pretty straightforward. It is really important that we understand this. But almost nobody does, because it is not something that we are taught in school.”
Science was the second hardest round, earning an average score of 6.1 points out of 20.
No team correctly guessed “religious leaders” as the least trustworthy source of climate information, according to a 2025 study using public polling from seven global south countries.
The highest-scoring round was general knowledge, with an average of 13.8 out of 20 questions answered correctly.
Carbon Brief would like to thank all the teams who took part and we look forward to hosting the quiz again in the spring of 2027.
If you would like to participate in next year’s quiz, please contact us in advance at quiz AT carbonbrief DOT org.
Photos by Kerry Cleaver
The post The Carbon Brief Quiz 2026 appeared first on Carbon Brief.
Just 1% of England’s land will be needed for renewables to help meet the UK’s climate goals by 2050, according to a first-of-its-kind framework.
There is enough land in England to meet climate and nature goals, while also producing more food and building new homes, according to the UK government’s new “land-use framework”.
Speaking at the framework’s launch on Wednesday, environment secretary Emma Reynolds said she hoped it would put an end to the idea that England faces “false choices” over “solar panels versus farmland”, or “growth versus environment”.
The policy was first planned by the Conservative government in 2022, but has been delayed many times.
It has been broadly welcomed by environmental groups, with Tony Juniper, the chair of Natural England, calling it a “vital step forward” towards “more joined-up approaches” to land use.
Below, Carbon Brief outlines the main points of the framework relating to climate change, nature restoration, food production, renewable energy and housing.
- What is the land-use framework?
- What does the plan say about how land in England should be used?
- What does the framework mean for different sectors?
What is the land-use framework?
The government’s land-use framework for England aims to set out a “coherent national vision” for using land.
The 56-page report is the first of its kind in England.
It focuses solely on England, but notes that the government will “work closely” with the devolved governments in Scotland, Wales and Northern Ireland to share best practice and “collaborate on cross-border issues”.
It is a “blueprint” to inform better decisions on optimising land use to produce food, host renewable energy, restore nature and build more homes, says environment secretary Emma Reynolds in the foreword of the framework.
The plan hopes to end the “fragmented approach” to tackling these issues, which has led to a “confused picture and missed opportunities for land to deliver multiple benefits”, Reynolds says in the foreword. She adds:
“We can plant trees to reduce flood risk to homes and farmland, locate energy infrastructure alongside nature-rich food production and ensure nature recovery is at the heart of resilient growth and development.”
The report says it will play a “critical role” in helping to deliver national and global commitments, such as carbon budgets and national biodiversity and climate plans.
The framework commits to creating a long-term assessment of climate change impacts on land use at 2C and 4C of global warming.
It also commits to setting up a “land-use unit” in the Department for Environment, Food & Rural Affairs to produce a map of “national spatial priorities” in England for, among other things, food production, nature and housing.
The government says it will update the framework every five years, outlining progress and next steps on implementation.
Currently, about 70% of land in the UK is used for agriculture – primarily livestock.
The chart below highlights how land is currently allocated in the UK (left) and how much overseas land is used to produce food for the UK (right).
The government’s land-use framework for England has been long-awaited and much-delayed.
The recommendation for the report first came in the 2021 National Food Strategy, an independent report led by businessman Henry Dimbleby.
It recommended creating a rural land-use framework to give “detailed assessments” of the best ways to use land in England.
The former Conservative government committed to produce such a report in a June 2022 food strategy.
This strategy said that a land-use framework for England would be released in 2023 “to ensure we meet our net-zero and biodiversity targets”, among other aims.
The publication was, however, delayed many times.
The Labour government launched a consultation on the framework in January 2025 and the final report was eventually released on 18 March 2026.
The framework is a “long-awaited opportunity for real change”, says Roger Mortlock, chief executive of the environmental charity Campaign to Protect Rural England (CPRE), in a statement.
Mortlock welcomes its “ambition”, but says that the way in which land tradeoffs are considered locally and nationally “will be key to its success”.
A report released by CPRE earlier this week, however, said that the framework is “unlikely to be the silver bullet many are hoping for”.
What does the plan say about how land in England should be used?
The framework uses high-resolution modelling – what it calls the “most sophisticated analysis” of its kind – to examine how England can use land to meet climate, nature, food and housing needs.
One key finding is that England has enough land to meet all of its objectives, if land is used efficiently.
This means that England has “enough land to deliver our objectives for nature restoration and development without reducing domestic food production or compromising on these objectives”, according to the framework.
It adds that efficient land use means “playing to the strengths” of England’s varied landscape. This involves, for example, prioritising the restoration of peatlands in north-west England and temperate rainforests in the south-west.
The chart below shows the percentage of land in England currently used for different purposes, as well as how this distribution will need to change by 2030 and 2050, if the UK is to meet its goals, according to the framework.
According to the framework, just 1% of England’s land will need to be taken up by renewables, such as solar and onshore wind, by 2050.
However, the framework does note that there is “inherent uncertainty” in projecting energy use by 2050 and says that the amount of land required for renewables may be nearer to “more than 2%”, depending on how quickly solar and wind is deployed in the future.
A further 6% of England’s land should be used for achieving climate and nature goals, according to the framework.
(A Defra official tells Carbon Brief that the framework’s projections for renewable energy and tree-planting were not as ambitious as those in the Climate Change Committee’s central pathway to net-zero, but are in line with the government’s carbon budget delivery plan for 2035.)
Speaking at the launch of the framework, environment secretary Emma Reynolds said that the framework shows that there are no “false choices” between “solar panels versus farmland” or “growth versus environment”, adding:
“The problem has never been scarcity of land. It has been a shortage of clarity.”
What does the framework mean for different sectors?
The framework sets out a “vision” for land use in several areas, such as housing, energy, food and nature by 2030 and 2050.
It also details what the government is currently doing to achieve these aims and makes pledges for more action down the line.
Below, Carbon Brief has detailed the key points around renewable energy, tree-planting and nature restoration, food production and housing.
Renewable energy
The report notes that the need to produce extra electricity to meet growing demand from, among other things, electric vehicles, heat pumps and data centres is “changing the way land is used across England”.
The UK plans to produce at least 95% of electricity from low-carbon sources, such as wind, solar and nuclear, by 2030.
Despite this, the report says that solar and wind will continue to make up a “small proportion of land use”. It says that, by 2030, much of this land will be “managed sustainably” for dual purposes, such as placing solar panels on the same land as growing crops.
Currently, around 21,000 hectares of land in the UK is covered by solar panels – which, as Carbon Brief has previously noted, is much less than the land used for golf courses.
By 2035, an additional 129,000 hectares of land is estimated to be used for solar and wind energy in England, with some of this land also used to produce food at the same time.
If achieved, this will account for 1% of land in England and 2% of the UK’s agricultural area.
This estimate is based on the assumption that all extra solar will be installed on the ground, which the report says is a “highly conservative and unlikely scenario” given that many panels are anticipated to be placed on rooftops.
This makes the 2035 figure an “upper-bound” estimate, says the report.
By 2050, around 155,000 hectares – roughly equal to the size of Greater London – will be used for renewables, the report estimates, adding that this is based on trends from historical data and not future scenarios.
The report adds that it is possible that more land than this will be needed to meet energy goals past 2035, however, citing the “inherent uncertainty” in figuring out what the mix of electricity sources will look like by 2050.
By 2030, coordinated planning of electricity networks will encourage rural investment, “such as through new data centres”, the report claims.
By 2050, the report says that better land-use planning will lead to a “fairer and more efficient distribution of solar and wind infrastructure across England”.
There will also be better electricity connections to renewables, much of which will be delivered alongside “productive agriculture”, such as by installing solar panels above crops – known as agrivoltaic farming.
The report says that any land-use change decisions should be made based on a number of factors, drawing from “local knowledge, values, data and priorities”.
It notes that development of wind and solar infrastructure in rural areas should give local communities the “opportunity to benefit from local clean energy”.
Tree-planting and nature restoration
According to the framework, 6% of England’s land will need to be used for achieving climate and nature goals by 2050.
This kind of land use includes restoring England’s carbon-dense peatlands, planting new woodlands and restoring heathland habitats.
As part of the analysis, the framework takes a detailed look at what parts of England would be best suited for nature restoration. It says:
“Habitat creation and restoration should be directed to the places where it can have the greatest ecological impact, help to reconnect fragmented landscapes, support priority species and deliver the greatest contribution to nature recovery.”
The chart below, taken from the framework, shows where in England has the greatest potential for nature restoration in dark green.
The analysis finds that north-west England has high potential for nature restoration, largely because it is home to the vast majority of the country’s carbon-rich, but degraded, peatlands.
Other areas identified include the south-west, which could be suitable for “grassland restoration and broadleaf woodland creation” and the south-east, where new grasslands could be planted, according to the framework.
The framework adds that the UK government remains committed to protecting 30% of land for nature by 2030, an international goal set under the Kunming-Montreal Global Biodiversity Framework.
However, it notes that, at present, just 7% of England’s land is protected for nature – with just four years to go until the deadline.
Speaking at the launch of the framework, nature minister Mary Creagh acknowledged that meeting the target remains a large challenge.
She added that her department was currently on a “data sprint” to try to account for all kinds of land that may not currently be classified as being protected for nature, despite serving this purpose.
Food production
The new framework extensively discusses how to balance food production with other uses for land, such as producing renewable energy and building homes.
The government says it is generally not suggesting land-use change on the country’s “best agricultural land”.
The framework focuses instead on using farmland to fulfil dual purposes, “rather than taking land out of production entirely”.
The goals outlined in the framework include increasing domestic food production in England, which the report says is “feasible according to our projections”.
Currently, the UK produces around 60% of its own food, importing the rest from abroad.
By 2030, the “vision” outlined in the framework says that farmers and other land managers will have better long-term clarity and more information on improved ways to use their land.
By 2050, meanwhile, farmlands will be managed to prioritise “sustainable food production and environmental benefits”, it says.
At this stage, the framework estimates that 480,000 hectares of farmland could be used primarily for food production, while also bringing environmental and climate benefits such as planting trees or restoring grassland habitats.
Agricultural land will be used to balance food production and other outcomes. A footnote in the report says that this will broadly lead to a “mosaic of different landscapes” – semi-natural land, low-intensity farmland and higher-intensity farmland.
It also says that, by 2050, farmland will be more resilient to climate change impacts through actions such as planting trees for flood and drought resilience.
All projected scenarios in the analysis behind the framework focus on producing food “more sustainably from less land”, the report notes.
The agricultural land-use change recommendations in the framework differ across the country. If focusing on improvements to water quality and biodiversity, for example, it recommends looking at areas with intensive agricultural production in the east of England.
This is due to these areas using high quantities of fertilisers, which can wash off fields and run into rivers and other waterways. This lowers water quality and harms plants and animals.
The government commits to developing sectoral growth plans, starting with horticulture and poultry, to provide a framework to boost production and “maintain food security”.
The government also promises to support making “under-used land” available for communities to grow food and recover nature, “where appropriate”. This refers to inactive land that is not suitable for other developments.
The report is a “step in the right direction”, says Tom Bradshaw, president of the National Farmers’ Union. He adds that it is “positive” to have “explicit recognition” of using land for multiple purposes and a government commitment to maintain food production.
Bradshaw notes that “challenges remain about delivering against the ambitious objectives as the first 2030 milestone approaches”.
Housing
Reynolds says that this framework can help to “speed up house-building and infrastructure delivery”.
The report says that, by 2030, improved planning will enable areas to facilitate housing and development “whilst protecting and enhancing the environment”.
It adds that, where appropriate, developments will be higher-density to “make the best use of land within our towns and cities”.
By 2030, biodiversity net gain – a planning requirement to improve habitats while building developments – and nature-based solutions will also be used to ensure development “leaves the natural environment in a measurably better state than it was in beforehand”, the report says.
It adds that timber production will be expanded to provide “low-carbon building materials”.
By 2050, meanwhile, the framework says planners will be able to more easily assess how suitable areas are for development “using a streamlined digital planning service and decision support tools”.
These tools – built on a range of data sources – are intended to reduce the number of homes built in areas at risk of flooding, the report says.
One in four homes in England are projected to be at risk of flooding by 2050, under a high-emissions scenario, the report outlines.
The report notes that the government is proposing a “default yes” to some planning applications for developments near well-connected transport stations.
High-demand areas “need to be powered locally and sustainably”, it notes, and using technologies such as rooftop solar to “make use of existing built land for electricity generation” can reduce land pressures elsewhere.
The post Q&A: What England’s new ‘land-use framework’ means for climate, nature and food appeared first on Carbon Brief.
Q&A: What England’s new ‘land-use framework’ means for climate, nature and food
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