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The UK government’s “high-risk” research funding agency last week announced that it will invest £57m ($76m) in a new solar geoengineering research programme.

Solar geoengineering” refers to methods that aim to address some of the impacts of a warming climate by reflecting away more sunlight from the Earth.

The programme, spearheaded by the Advanced Research and Invention Agency (Aria), will fund 21 projects globally.

This includes small-scale outdoor experiments, involving attempts to thicken Arctic sea ice and brighten clouds above Australia’s Great Barrier Reef to reflect away sunlight.

The news was reported breathlessly by the UK media, with some outlets conjuring images of the government one day “dimming the sun” or trying to modify the weather and others focusing on the “secretive” nature of Aria and its research.

The reaction was even more exaggerated on social media, where anonymous accounts seized upon the news to spread misinformation about existing “secret” government schemes to “control” the weather.

At the same time, the programme – first reported last year – has sparked legitimate debate among climate scientists, who have long held diverging views on whether more research funding should be channelled into solar geoengineering.

Below, Carbon Brief explains what the new solar geoengineering research programme consists of and explores the social and ethical concerns surrounding the technology.

What is the UK’s new solar geoengineering research programme?

Solar geoengineering is a term used to describe a group of hypothetical technologies that could, in theory, counteract temperature rise by reflecting more sunlight away from the Earth’s surface. (It is also sometimes called “solar radiation modification”.)

The most commonly proposed idea is to introduce reflective aerosols high up into the stratosphere, which would lower global temperatures in a similar way to a volcanic eruption.

Other ideas include deliberately modifying clouds to make them more reflective or sending giant mirrors into space.

Solar geoengineering options. Graphic by Rosamund Pearce for Carbon Brief
Solar geoengineering options. Graphic by Rosamund Pearce for Carbon Brief.

The proposals may sound futuristic, but the notion of engineering the climate in order to limit sunlight has been debated by scientists and politicians for more than 50 years.

However, these debates have always proved controversial, meaning – apart from studies based on computer simulations – little field research into solar geoengineering has been carried out. (See: How does this compare to past solar geoengineering efforts in the UK and globally?)

Aria’s new research programme aims to invest £57m in 21 solar geoengineering research projects globally.

This – along with a separate £10m scheme from the UK Research and Innovation body – means the UK is now one of the world’s biggest funders of solar geoengineering research.

Announcing the details of the scheme, Aria said its motivation for launching the research programme was “the possibility of encountering damaging climate tipping points”.

Out of the £57m, around £24.5m ($33m) will be spent on “controlled, small-scale outdoor experiments”, according to Aria.

These include attempts to thicken Arctic sea ice, brighten clouds above Australia’s Great Barrier Reef and to float weather balloons containing natural minerals high in the stratosphere, which will be retrieved after “hours or weeks”.

All outdoor experiments will be “scrutinised” by an oversight committee chaired by Prof Piers Forster, a leading climate scientist who is the founding director of the Priestley Centre for Climate Futures at the University of Leeds.

In a note released alongside news of the research funding, the oversight committee said it does “not exist to legitimise this programme”, adding:

“We advise Aria on the risks and benefits of supporting proposed creator projects and how best to work with and across creator teams to support learning and to help ensure that findings are contextualised and communicated appropriately alongside [climate] mitigation and adaptation options.”

Aria is a “high-risk, high-reward” government research agency that was formally established through an act of parliament in 2023.

It was originally conceptualised by Dominic Cummings, a controversial former adviser of then prime minister Boris Johnson.

According to Nature, Aria was modelled on the “famed US Defense Advanced Research Projects Agency, or DARPA, which helped to pioneer some of the world’s most consequential technologies, including the internet and personal computers”.

In its recent coverage, the Daily Telegraph described Aria as a “secretive government unit”.

Aria itself has said that it aims to be fully transparent about its solar geoengineering programme, which was its motivation for publicly announcing its spending on the 21 projects involved.

How does this compare to past solar geoengineering efforts in the UK and globally?

As mentioned above, the idea of solar geoengineering has been debated for more than 50 years. However, its controversial nature has meant that, until now, very few field experiments have been carried out.

In 2010, there was an attempt to carry out field research in the UK by the Stratospheric Particle Injection for Climate Engineering (SPICE) project, which was headed by Dr Matthew Watson at the University of Bristol and involved scientists from the University of Oxford, the University of Cambridge and the University of Edinburgh.

The project aimed to “investigate the effectiveness” of solar geoengineering, in part by releasing the equivalent of a bathtub of water high into the atmosphere above Norfolk.

However, it was met with fierce opposition by some campaign groups. In 2012, the team ended the project, citing issues with intellectual property and discomfort with the current lack of regulation and governance of solar geoengineering research.

(Watson is one of the recipients of Aria’s new research programme. His team has been awarded £4.3m ($5.7m) to build specialised drones to study emissions from regularly erupting volcanoes in Guatemala, Montserrat and Chile.)

Outside of the UK, another high-profile solar geoengineering experiment headed by researchers at Harvard University, called the Stratospheric Controlled Perturbation Experiment (Scopex), was also forced to disband following public disapproval.

In the private sector, a US start-up called Make Sunsets has begun releasing high-altitude balloons containing sulphur dioxide into the stratosphere, in an attempt to geoengineer the planet. It funds its activities by selling “cooling credits”.

The company has been banned in Mexico, where it previously launched balloons, and is currently being investigated by the US Environmental Protection Agency.

According to the online publication SRM360, funding for solar geoengineering has increased from $34.9m in 2010-14 to $112.1m in 2020-24. The vast majority of funding is concentrated in global-north countries and about half of all funding comes from philanthropic sources.

This week, scientists and policymakers are meeting in Cape Town, South Africa for the largest summit to date on the scientific, social and political implications of solar geoengineering.

Countries have agreed to a de facto moratorium on large-scale solar geoengineering under the Convention on Biological Diversity, a UN treaty that aims to protect biodiversity. (However, it is not legally binding.)

Why do some scientists say solar geoengineering research is needed?

Scientists agree that cutting global greenhouse emissions as soon as possible is key to tackling climate change.

But global emissions are still rising – and the prospect of limiting global warming to 1.5C above pre-industrial levels, the ambition of the landmark Paris Agreement, without first “overshooting” the target is fast vanishing.

This has led some scientists to call for more research into solar geoengineering ideas, including through small-scale experiments and trials.

Research based on computer modelling indicates that artificially cooling the planet by releasing reflective aerosols into the stratosphere using specialised planes could be effective at offsetting a range of climate impacts, such as more intense heatwaves and flooding, melting sea ice and higher tropical storm risk.

(One solar geoengineering scientist has estimated that halving global warming with reflective aerosols would involve a specialised fleet of about 100 planes releasing 1m tonnes of sulfuric acid each year by 2070.)

However, this type of solar geoengineering would not address rising CO2 levels, which are causing oceans to become more acidic and crops to become less nutritious, among other issues.

Some scientists have raised concerns that, if aerosols were used to address global warming, the world could be left at risk of a “termination shock”. That is, if aerosols were released and then suddenly stopped – as a result of political disagreement or a terrorist attack, for example – global temperatures could rapidly rebound.

This sharp temperature change could be “catastrophic” for wildlife, modelling studies have suggested. However, other research argues that the likelihood of a termination shock has been “overplayed” and that measures could be put in place to ensure that the risk is minimised.

There is also a risk that deploying aerosols from just one spot on Earth could cause uneven impacts for people. One research paper based on modelling found that releasing aerosols in just the northern hemisphere could lead to a decrease in rainfall – and, therefore, an enhanced drought risk – in India and the African Sahel.

Ultimately, advocates of solar geoengineering research tend to argue that the only way to understand more about the efficacy and risks of the technology is to study it further, whereas opponents say more research could be a “slippery slope” towards deployment.

Why are there social and ethical concerns around solar geoengineering?

As well as scientific uncertainties, experts have long warned that solar geoengineering poses large social, ethical and governance challenges.

Some scientists and campaigners are fundamentally opposed to the idea of manipulating the climate further in order to try to repair some of the damage caused by fossil-fuel emissions.

Writing in the Guardian, climate scientists Prof Raymond Pierrehumbert and Dr Michael Mann described Aria’s research programme as “like using aspirin for cancer”.

Indigenous groups have strongly opposed the idea of solar geoengineering and its research, often arguing it goes against their beliefs about living in harmony with nature.

Some scientists and campaign groups also believe that solar geoengineering could be viewed by politicians and the public as a quick “technofix” to climate change. If more research and development is channelled into these techniques, they argue, people may start to backpedal on their promises to cut their emissions.

This is often referred to as the “moral hazard” dilemma.

But other researchers have urged caution on this idea. One reason for this is that social experiments conducted with members of the public have found little evidence of the moral hazard problem existing in practice.

Advocates of solar geoengineering research say it should be viewed as a “supplement” to climate mitigation efforts rather than a “substitute” or “quick fix”.

However, many experts and commentators have pointed out that the technology presents a very large global governance challenge.

A fair and just deployment of solar geoengineering would require agreement between countries, experts have reasoned. At present, it is difficult to picture a global forum that could garner such collaboration, they say.

Prof Alan Robock, a professor in the department of environmental sciences at Rutgers University, summarised this issue neatly in a conversation with Carbon Brief in 2018, when he said:

“You’re asking if the world can come together and agree on geoengineering without agreeing on mitigation. I think the answer is for us to agree on mitigation. Paris is the first step, the pledges made there aren’t enough but have got to increase.”

Another concern is the “free-driver problem”, an idea that refers to the potential for a single country, group or even individual to unilaterally deploy solar geoengineering, even if it might cause negative impacts for others. This concern arises from the fact that solar geoengineering would be relatively cheap to carry out.

It has been argued that the free-driver problem poses a larger concern than ever in today’s increasingly polarised world, where lone politicians and billionaires hold large amounts of power.

These serious social and governance issues prompt some experts to say solar geoengineering should not be researched at all, but others to say it should be researched to try to address concerns.

Out of Aria’s £57m for solar geoengineering research, around £2.8m ($3.7m) is earmarked for governance and ethics projects.

In its latest assessment for how the world can address climate change, the world’s authority on climate science, the Intergovernmental Panel on Climate Change (IPCC), notes that there is “high agreement” among research papers that solar geoengineering “cannot be the main policy response to climate change and is, at best, a supplement to achieving sustained net-zero”.

The assessment also notes that solar geoengineering “may introduce novel risks for international collaboration and peace”.

The post Factcheck: How the UK is – and is not – studying solar geoengineering appeared first on Carbon Brief.

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Battle over cleaning up shipping set to resume at London talks

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The US is expected to resume its attempt to sink measures for a greener global shipping sector at closed-door talks between governments at the International Maritime Organization (IMO) in early September.

The US and oil-producing allies like Saudi Arabia want to weaken a proposed plan for cleaner fuels that aims to reduce planet-heating emissions from the industry, which relies heavily on dirty bunker fuels. Shipping currently represents 3% of global emissions.

Those that want a softer system are likely to back a Liberian proposal which expert analysis suggests would see emissions fall by only half at most by 2050, far short of the sector’s agreed climate goals.

After several years of debate, governments provisionally agreed in April 2025 on the “Net Zero Framework” (NZF), a series of emissions reduction targets for shipowners, backed up with financial rewards for meeting the targets and fees for missing them.

But in October 2025, after a high-profile intervention from US President Donald Trump and threats of sanctions and visa restrictions, the US convinced a majority of voting nations to postpone the adoption of the NZF for a year.

Ralph Regenvanu, climate minister for the Pacific nation of Vanuatu, called the delay “unacceptable” given the urgency of accelerating climate change.

After a round of low-profile talks in May, the first of three further sets of talks on how to clean up shipping will begin at the IMO’s riverside headquarters in London on Tuesday, culminating in a final public session in November.

Em Fenton, who follows the talks as senior director of climate diplomacy at Opportunity Green, an NGO focused on aviation and shipping, said governments should not be sidetracked by alternative proposals to the NZF, calling them “a distraction from a hard-fought multilateral compromise”.

“If countries want to deliver a just and fair maritime transition, there is really only one choice: back the NZF and stand together in solidarity against those who would tear it apart,” Fenton added.

Five proposals on the table

Governments will discuss five different proposals submitted in advance of next week’s meeting. The most ambitious of these is from the Pacific island nation of Tuvalu, which has proposed a levy on the entirety of a ship’s emissions rather than just those above a certain level, as the NZF envisions.

That had been the original demand of Pacific nations before the NZF was provisionally adopted in April 2025. At the time, Tuvalu’s transport minister Simon Kofe described the NZF as disappointing and not ambitious enough.

For this reason, six Pacific countries abstained in the vote on the NZF. While they supported the original plan for its adoption in October 2025, they have used the delay to push again for more ambition.

John Kautoke, advisor to a group of Pacific nations called 6PAC+, told Climate Home News that the NZF “cannot diminish its already inadequate ambition. If anything, the NZF must increase in ambition if we are going to renegotiate its parameters.”

    Analysis by the Institute of Marine Engineering, Science and Technology (IMarEST) suggests that, of the five proposals, only Tuvalu’s would meet the 2030 and 2040 emissions reduction targets for global shipping that were agreed by governments in 2023. Those were for cuts of 20% between 2008 and 2030, 70% by 2040 and then reaching net zero “by or around, i.e. close to 2050”.

    Despite this, the UK, Australia, Canada and South Africa have formally proposed that governments adopt the NZF, which won support in a 63-13 vote among governments at the April 2025 talks. Trump’s US walked out halfway through.

    According to IMarEst’s analysis, while the NZF proposal will not be enough to meet the industry’s targets, it will reduce emissions more cheaply than the Pacific proposal.

    A proposal by Brazil – which fought hard for the NZF last October – suggests tweaking the framework to make meeting targets easier in the short term and harder in the long term.

    While this compromise will make it more appealing to the owners of polluting ships and countries that support them, IMarEst estimates it would lead to higher cumulative emissions than either the NZF or Pacific proposals.

    The NZF stipulates that fees for high-polluting shipowners should be be put into a Net Zero Fund and used to promote clean shipping fuels and a fairer transition. The Brazilian proposal would delay raising and spending these funds by two years, from 2029 to 2031.

    Liberia’s proposal weakens emissions cuts

    The US and Saudi Arabia are likely to swing behind a new proposal from Liberia, whose government makes millions of dollars a year selling the right for shipowners to register their vessels in the small West African nation via a US-based company.

    This proposal would weaken the emissions reduction targets. IMarEst says it would cut the industry’s emissions at most by a half by 2050, falling far short of the target agreed in 2023 for international shipping to reach net zero “close to 2050”.

    It would also replace the NZF’s fees for missing targets with a carbon trading system. As a result, there would be no Net Zero Fund and therefore less money available to incentivise green fuels and make the transition more equitable for poorer nations.

    Pacific advisor Kautoke said that, as well as preventing shipping from reaching zero emissions by 2050, Liberia’s proposal would mean the Pacific “will not receive any support to deal with the disproportionately negative impacts created by the cost of the transition”.

    “We get a double blow if we adopt the Liberian proposal,” he warned. “We get all the cost of a transition without any support, and we have an industry that continues to burn fossil fuels to an unforeseen point.”

    Japanese proposal favours shipowners

    Japan has submitted a late proposal to amend the NZF so that shipowners have more control over how the fees they would pay for emitting above a set threshold are spent.

    University College London professor Tristan Smith has argued that this change means there will be no central mechanism to incentivise investments in clean fuels. He wrote on LinkedIn that under the system put forward by Japan, shipowners would be able to select which green projects their fees would go to. They could choose their own or those of a sister company or other shipowners, rather than funding broader just transition projects that would benefit marine workers or developing countries hit by rising shipping costs.

    Despite its flaws, Smith added that Japan’s proposal “could still get taken seriously by some, given how appealing it may seem to shipowners who have consistently demanded control of revenues, and given how the US and other member states have pushed back against the IMO Net Zero Fund and [greenhouse gas] pricing.”

    Tacit or explicit approval?

    Next week, governments are expected to make statements saying which proposals – or which aspects of proposals – they prefer. Another set of talks will be held from November 23-27 before a potentially final round from November 30-December 4.

    A new framework to tackle shipping emissions could be adopted at those talks if two-thirds of countries that are present and signed up to a regulation called Marpol Annex VI – endorsed by just over 100 states – vote in favour of it, as they did in April 2025.

    The US and its allies are also trying to change the rules to make the next stage more difficult. Decisions that have been adopted at IMO meetings usually take effect automatically unless a certain number of countries object within a certain time period decided by governments, a system known as tacit approval.

    But the US wants that to require explicit approval instead, so that any new emissions standard would not come into force unless enough governments – representing a certain percentage of the world’s shipping fleet – actively indicate support for it.

    Critics say this change would give a small number of countries with large shipping registries the power to block implementation. Liberia has the world’s biggest shipping registry, run by an American company, followed by Panama and the Republic of the Marshall Islands.

    Liberia and Panama have supported the US at the talks on the Net Zero Framework. The Marshall Islands has long been one of the most vocal supporters of climate action in shipping but, with its officials and shipping registry income vulnerable to US retaliation, did not sign on to the recent Pacific proposal vowing to strengthen the NZF if it is re-opened.

    Brazilian negotiator Adriana de Medeiros Gabinio warned in April that the NZF’s opponents are trying to change the rules by which it comes into force as a “safety net to block” it.

    The post Battle over cleaning up shipping set to resume at London talks appeared first on Climate Home News.

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    Coles, Woolworths failing on deforestation commitments 

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    SYDNEY, Wednesday 26 August 2026 — New 2026 Sustainability Reports released by supermarket giants Coles and Woolworths this week demonstrate the retailers are failing on their commitments to end deforestation in their supply chains.

    Adele Chasson, Nature Policy Lead at Greenpeace Australia Pacific said:

    “These so-called sustainability reports are revealing. Despite their public commitments in 2024 and 2025, neither Coles nor Woolworths have taken deforestation-linked beef off their shelves. Meanwhile, bulldozers continue to tear up forests and bushland, pushing wildlife closer to extinction and causing mass toxic runoff to flow into the Great Barrier Reef. Millions of native animals like koalas are losing their homes to beef pastures each year, while the big supermarkets put off action.

    “Australians would be shocked to know that beef on the shelves of our biggest supermarkets could be pushing threatened species to the brink of extinction. Collectively Coles and Woolworths have made more than $2 billion in profits in the last year, profiting from the destruction of wildlife and precious Australian nature. Coles and Woolworths owe it to shoppers to deliver on their promises and end deforestation in their supply chains now.

    “As big beef buyers, Coles and Woolworths have an essential role to play in keeping Australia’s unique forests standing. They can help stop the Great Barrier Reef from being poisoned by runoff and protect iconic forest wildlife by taking deforestation off their shelves. It’s time these big companies put their money where their mouths are and follow through on their promise of sourcing and supplying deforestation-free beef.”

    Coles, Woolworths failing on deforestation commitments 

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    New Zealand moves to protect business with law curtailing climate litigation

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    New Zealand’s parliament has adopted a controversial new law blocking a whole avenue of climate litigation and shutting down its most advanced corporate lawsuit, which has been blamed by the government for shaking business confidence and investment.

    The Climate Change Response (Tort Liability) Amendment Bill, expected to take effect in the coming days after it is formally signed by the Governor-General, prevents all current and future civil claims for climate loss or harm under tort law.

    Justice minister Paul Goldsmith said last week that the aim was to give businesses “certainty around their climate change obligations”, noting it would not alter the government’s responsibilities under the Climate Change Response Act 2002 nor business obligations under the Emissions Trading Scheme.

    “Our response to climate change is best managed by the Government at a national level and not through piece-meal litigation in the courts,” he added in a statement.

    Such litigation, he said, “risks developing a new regime that contradicts the framework Parliament has already enacted” to tackle climate change.

      Goldsmith singled out a key domestic climate lawsuit brought by Northland iwi leader and activist Mike Smith against six big companies: dairy firms Fonterra and Dairy Holdings, energy firms Genesis Energy and Z Energy, New Zealand Steel and coal mining firm BT Mining. A seventh original defendant, Channel Infrastructure, was dropped after it permanently decommissioned its Marsden Point oil refinery.

      Smith argued that these companies had caused him harm under public nuisance and negligence law, as well as a third breach of a duty to cease contributing to climate change that has yet to be tested domestically. He did not seek financial compensation, instead asking for the companies to immediately stop emitting or contributing to net greenhouse gas emissions.

      In one of the most advanced corporate climate accountability lawsuits in the world, a trial had been scheduled for April 2027 after the Supreme Court unanimously allowed the case to continue.

      Corporate lobbying in the shadows

      Smith described the passing of the bill as “deeply concerning”, particularly as it coincided with the Supreme Court hearing another of his climate lawsuits. In that case, Smith v Attorney-General, he argues that the government’s response to climate change and its impacts on Māori communities in particular breaches rights to life and culture.

      “That timing raises profound questions about the separation of powers and the rule of law,” said Smith. “Whatever one’s view of the merits of these cases, it is deeply troubling when parliament intervenes to remove a legal pathway while the courts are actively considering fundamental questions about climate responsibility, rights and the crown’s obligations.”

      The bill – which says that no person (including the government) can be found liable in tort for emissions-related climate change effects – followed major lobbying efforts by the companies defending themselves in Smith’s lawsuit. They outlined a proposed legal amendment in a briefing note to the government in 2024.

      The centre-right government has been fiercely criticised over its lack of transparency in relation to this lobbying activity. The national ombudsman recently found that the Prime Minister’s Office effectively withheld information requested by the Environmental Law Initiative about meetings, discussions and conversations regarding Smith’s case.

      Green groups fail to stop bill

      The bill sparked huge concern among environmental campaigners in New Zealand and elsewhere. Greenpeace Aotearoa called it a “shocking abuse of executive power” and the vast majority of submissions to a parliamentary inquiry said it should be rejected.

      But in the end, it was adopted with little resistance, moving relatively smoothly through parliament, passing its third reading by 67 votes to 53. Sam Bookman, climate law lecturer at Melbourne Law School, told Climate Home News he was not surprised by this, given that the coalition government has a secure majority.

      A complaint has been made to the UN special rapporteur on climate change and human rights by Smith, the National Iwi Chairs Forum Pou Tikanga and youth coalition Climate Clinic Aotearoa over what they see as the government’s heavy-handed approach. Smith is also challenging the new law in yet another lawsuit.

      “Pathetic”: New Zealand plans to barely cut emissions between 2030 and 2035

      Bookman thinks it “very unlikely” that such a challenge will succeed, noting that New Zealand’s constitution is firmly anchored in parliamentary sovereignty.

      But the expert in climate law does not see the bill as the end of legal action in the country, noting that New Zealand has a “sophisticated climate litigation landscape with a growing number of specialist and experienced lawyers and NGOs”.

      The country is also approaching its next general election in November, and some opposition parties have pledged to restore access to the courts if elected.

      Amanda Larsson, global project lead on agriculture for Greenpeace International, said: “This law deserves to be tested, and I strongly encourage the international climate litigation community to unite and help defend New Zealanders’ fundamental right to hold polluters accountable before this becomes a global blueprint.”

      Copycat legislation on the rise

      New Zealand’s move is part of a small but growing legislative effort to shut down climate litigation around the world.

      In the US, Republican politicians introduced legislation in the House and Senate in April that would shield fossil fuel firms from climate liability lawsuits. Similar laws have already been passed at state level in Tennessee, Utah, Iowa and Louisiana.

      The German state of Bavaria has put forward a similar proposal to the Federal Council, aiming to block private climate claims as well as the recognition and enforcement of foreign judgments imposing such liability. There are also proposals to limit available remedies and actions in the Netherlands and Belgium.

      UN General Assembly backs “climate obligations” set by world’s top court

      Bookman said he expects more efforts to counter climate damages litigation and advised plaintiffs to think about how to respond, including drawing on broader support in opposing them.

      “Even though it’s very hard for plaintiffs to win these types of cases, companies are very eager to avoid the expense, embarrassment and political accountability that come even with unsuccessful lawsuits,” he said.

      The post New Zealand moves to protect business with law curtailing climate litigation appeared first on Climate Home News.

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