Reducing the amount of sunlight reaching the Earth could take the edge off global warming and limit the damage caused by climate change, according to Britain’s leading scientific body.
But the Royal Society has warned that strategies aimed at bringing about these changes are not without risk.
The society, which sparked the scientific revolution in the 17th century, said in a new report that bold new technology for reflecting sunlight back into space could “buy time” for cuts in fossil fuel emissions to take effect.
It said two strategies – pumping reflective particles high in the atmosphere and spraying salt into clouds over the sea to make them whiter – are likely to be effective, as well as technically feasible.
But the report’s authors warn a rogue nation going alone, and attempting to dim sunlight in one region, could cause extreme droughts and other weather disturbances elsewhere in the world.
Professor Keith Shine, chair of the report’s working group, said there could nevertheless be a time when world leaders agree that solar radiation modification (SRM) is the least worst option.
“This is not a question of whether SRM is safe, as it is clearly not without risks,” he said.
“However, there may come a point where those risks are seen to be less severe than the risks of insufficiently mitigated climate change.”
The report said global efforts to reduce greenhouse gas emissions look increasingly unlikely to stop global temperatures rising above 1.5C, considered by many scientists to be a “safe” limit.
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A new round of UN climate talks will start later this week in Brazil, but under current policies, temperatures are likely to be at least 3C warmer than pre-industrial times by 2100.
The working group ranked stratospheric aerosol injection as the most promising option for dimming the amount of sunlight reaching the Earth’s surface.
Planes would fly at high altitude, releasing sulphur dioxide gas, which would form particles that reflect a small amount of sunlight.
There is real-world evidence that this could work. The 1991 eruption of Mount Pinatubo, a volcano in the Philippines, pumped 15 million tonnes of sulphur dioxide into the stratosphere, reducing the temperature by 0.5C for one to two years.
Computer models suggest that releasing eight to 16 million tonnes of the gas from planes each year across both the northern and southern hemispheres could reduce the global temperature by 1C.
The likely cost would be “in the low 10s of billions of dollars a year”, said Prof Shine.
That’s far less than the global cost of more extreme weather, wildfires, and other climate impacts.
Hurricane Melissa, which was made more intense by global warming, cost up to $52bn (£39.9bn) in damage and economic losses across the western Caribbean, according to AccuWeather.
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Did climate change make Hurricane Melissa worse?
The Royal Society’s report warns that SRM would not tackle the root cause of climate change, and is not an alternative to reducing emissions.
But it could reduce temperatures while carbon dioxide levels in the atmosphere peak and begin to fall. It could mean SRM would need to be deployed for 100 years or more.
The UK’s economic slowdown gathered further momentum during the third quarter of the year with growth of just 0.1%, according to an early official estimate that makes horrific reading for the chancellor.
The Office for National Statistics (ONS) reported a surprise contraction for economic output during September of -0.1% – with some of the downwards pressure being applied by the cyber attack disruption to production at Jaguar Land Rover.
The figures for July-September followed on the back of a 0.3% growth performance over the previous three months and the 0.7% expansion achieved between January and March.
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3:22
Growth ‘slightly worse than expected’
The encouraging start to 2025 was soon followed by the worst of Donald Trump’s trade war salvoes and the implementation of budget measures that placed employers on the hook for £25bn of extra taxes.
Economists have blamed those factors since for pushing up inflation and harming investment and employment.
ONS director of economic statistics, Liz McKeown, said: “Growth slowed further in the third quarter of the year with both services and construction weaker than in the previous period. There was also a further contraction in production.
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“Across the quarter as a whole, manufacturing drove the weakness in production. There was a particularly marked fall in car production in September, reflecting the impact of a cyber incident, as well as a decline in the often-erratic pharmaceutical industry.
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5:10
What next for the UK economy?
“Services were the main contributor to growth in the latest quarter, with business rental and leasing, live events and retail performing well, partially offset by falls in R&D [research and development] and hair and beauty salons.”
When measured by per head of population- a preferred measure of living standards – zero growth was registered during the third quarter.
The weaker-than-expected figures will add fuel to expectations that the Bank of England can cut interest rates at its December meeting after November’s hold.
The vast majority of financial market participants now expect a reduction to 3.75% from 4% on 18 December.
Data earlier this week showed the UK’s unemployment rate at 5% – up from 4.1% when Labour came to power with a number one priority of growing the economy.
Since then, the government’s handling of the economy has centred on its stewardship of the public finances.
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1:41
Chancellor questioned by Sky News
The chancellor was accused by business groups of harming private sector investment and employment through hikes to minimum wage levels and employer national insurance contributions.
The Bank has backed the assertion that hiring and staff retention has been hit as a result of those extra costs.
There is also evidence that rising employment costs have been passed on to consumers and contributed to the UK’s stubbornly high rate of inflation of 3.8% – a figure that is now expected to ease considerably in the coming months.
Rachel Reeves has blamed other factors – such as Brexit and the US trade war – for weighing on the economy, leaving her facing a similar black hole to the one she says she inherited from the Conservatives.
She said of the latest economic data: “We had the fastest-growing economy in the G7 in the first half of the year, but there’s more to do to build an economy that works for working people.
“At my budget later this month, I will take the fair decisions to build a strong economy that helps us to continue to cut waiting lists, cut the national debt and cut the cost of living.”
Shadow chancellor Sir Mel Stride responded: “Today’s ONS figures show the economy shrank in the latest month, under a Prime Minister and Chancellor who are in office but not in power.”
The Scottish government and For Women Scotland’s long-running legal battle over the definition of a woman is yet to come to a close.
For Women Scotland (FWS) won the case in April when the country’s highest court ruled “woman” and “sex” in the Equality Act 2010 refers to “a biological woman and biological sex”.
The Scottish government was ordered to pay a portion of the campaign group’s legal costs.
FWS told Sky News the bill of costs for the Supreme Court element of the case was more than £270,000, however various parts have reportedly been disputed by the Scottish government.
That has now been submitted to the court for determination and a decision is awaited.
Image: Pic: PA
The Outer and Inner House element of the case at the Court of Session in Edinburgh was said to be more than £150,000.
Trina Budge, co-director of FWS, said the group is also due an uplift – a small percentage of the final expenses awarded.
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Ms Budge claimed Scottish ministers are yet to enter into any negotiations on settlement and a date has been set in January for a hearing before the Auditor of the Court of Session to confirm the amount the government will have to pay.
Ms Budge said: “The delay always suits the paying party but I think it’s quite unusual to decline to enter into any discussions at all.
“It’s highly likely this is a deliberate tactic in the hope of starving us of funds to prevent us continuing our latest case on the lawfulness of housing male prisoners on the female estate.
“However, it should come as no surprise to the government that we have massive support and we will, of course, be continuing regardless of any sharp practices.”
Image: Susan Smith and Marion Calder, co-directors of For Women Scotland, outside the Supreme Court in London in April. Pic: PA
It is understood the bill of costs for the Supreme Court case was lodged by FWS in August, while the expenses linked to the Court of Session action was submitted in September.
Figures revealed by a recent Freedom of Information (FOI) request show the Scottish government has spent at least £374,000 on the case.
Final costs are yet to be confirmed but will be published once complete.
A Scottish government spokesperson said: “There is an established process to be undertaken to agree the final costs for a legal case and these will be calculated and published in due course.”
If possible, schools can also provide gender neutral toilets for transgender students.
However, court proceedings continue over transgender prisoners.
Current SPS guidance allows for a transgender woman to be admitted into the female estate if the inmate does not meet the violence against women and girls criteria, and there is no other basis “to suppose” they could pose an “unacceptable risk of harm” to those also housed there.
First Minister John Swinney and Justice Secretary Angela Constance have both dodged questions on the case, citing it would be inappropriate to comment on live court proceedings.
Image: Justice Secretary Angela Constance and First Minister John Swinney. Pic: PA
On Tuesday, Ms Constance was accused by former Scottish Tory leader Douglas Ross of “misleading” Holyrood, saying she could give full answers under contempt of court legislation.
Scottish Tory MSP Tess White, the party’s equalities spokesperson, added she was “spine-chillingly concerned” of a repeat of the Isla Bryson case.
Image: The case of Isla Bryson sparked a public outcry after the double rapist was sent to a women-only prison. Pic: PA
Bryson, a transgender woman born Adam Graham, was initially sent to a women-only prison despite being convicted of raping two women.
The offender was later transferred to the male estate following a public outcry.
Speaking to Sky News, Ms White said: “John Swinney was quick to waste taxpayers’ money fighting a case which confirmed what the vast majority of the public knew beforehand: a woman is an adult human female.”
The MSP for North East Scotland urged the SNP administration to “pay up and finally respect the clear judgment from the Supreme Court”.
A Scottish government spokesperson said: “It is the Scottish government’s long-held position that it is inappropriate for Scottish ministers to comment on live litigation.
“In all cases, we have an obligation to uphold the independence of the judiciary. We do not want the government to ever be seen as interfering in the work of the independent courts.”
The storm, named by Spain’s meteorological service, is currently affecting the Canary Islands.
Claudia could result in travel disruptions, power cuts, and flooding in some areas, according to the Met Office.
Met Office Chief Meteorologist Matthew Lehnert said: “Storm Claudia will bring very heavy rainfall to a large swathe of central and southern England and Wales on Friday into Saturday.
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“This rain will become slow moving, and some areas could see up to a month’s worth of rain in 24 hours.
“Within the Amber warning areas, some could see in excess of 150mm accumulate during the event, with 60-80mm fairly widely.”
Strong winds across northwest England and northwest Wales pose an added hazard, with gusts of up to 70mph possible in exposed areas within the warning zone, he added.
A colder weekend
By the weekend, the north of the UK will see a colder air mass, with overnight frosts, according to the Met Office.
Some showers will persist, but overall it will be a considerably drier and brighter period of weather in this area.
Further south, the weekend will start off largely cloudy and wet, and still mild in the far south. Gradually, the rain will ease and eventually clear to the south, with the drier, colder conditions further north spreading to all areas by the start of next week.
Early next week, temperatures will drop sharply across the country, particularly in the north and east, bringing the first snow of the season in some areas.