The UK government has announced a £50 million programme to fund outdoor geoengineering experiments, making the nation one of the world's largest backers of the controversial technology. The Advanced Research and Invention Agency (Aria) will oversee small-scale tests designed to gather critical data on methods that could temporarily slow climate change by blocking sunlight.
Proposals under consideration include releasing reflective particles into the atmosphere or using seawater sprays to brighten clouds. Supporters argue that such solar radiation management (SRM) could provide an emergency brake if global warming triggers catastrophic tipping points, such as the collapse of ice sheets or ocean currents.
However, critics warn that SRM poses serious risks, including disrupting rainfall patterns vital for agriculture, and could distract from the urgent need to cut carbon emissions. Some scientists have called the approach 'barking mad' and akin to 'treating cancer with aspirin'.
Prof Mark Symes, leading the Aria programme, emphasised that real-world data is essential. 'Modelling and indoor studies can only tell us so much,' he said, adding that no toxic substances would be released and environmental impact assessments would be published. Details of funded projects are expected in weeks.
The UK's National Environment Research Council has also announced a separate £10 million programme to study geoengineering via computer modelling and natural analogues, without new outdoor experiments. Global funding for geoengineering remains modest, but with US research under threat, the UK could become the leading funder.
