
04/27/2025
The UK government is set to approve a major research effort exploring whether dimming the sun could help fight climate change, with over $66 million earmarked for experiments and analysis.
Overseen by the Advanced Research and Invention Agency (Aria), the initiative will focus on controversial geo-engineering techniques, including spraying aerosolized particles into the stratosphere to reflect sunlight and potentially cool the planet.
Scientists point to natural examples, such as volcanic eruptions, that have caused temporary global cooling, but warn that deliberate interventions could trigger unintended and possibly catastrophic disruptions to weather patterns.
Other methods under study include marine cloud brightening-using sea salt to make clouds more reflective-and thinning cirrus clouds, which trap heat. All options remain contentious, with critics arguing that geo-engineering could undermine efforts to reduce carbon emissions at their source.
Aria, inspired by America's DARPA agency, has over $1 billion to spend over four years on high-risk, high-reward research. Led by Professor Mark Symes, the new climate programme could involve small outdoor experiments. The agency also suggested that insights gained could eventually support efforts to terraform other planets.