Written By: Rezina Tuladhar

The UK is moving closer to testing new technologies that aim to cool the planet by reflecting sunlight away from Earth. This method, called Solar Radiation Modification (SRM), is part of a larger effort to tackle the growing threat of climate change. The Advanced Research and Innovation Agency (ARIA), a government-supported organization, is investing nearly £60 million into five projects that could lead to real-world experiments. These projects explore ways to make Arctic ice more reflective, brighten clouds to reflect more sunlight, and even use weather balloons to test how particles behave high in the atmosphere.

Some of these techniques are inspired by natural events like volcanic eruptions, which have shown to temporarily cool the Earth by releasing particles into the air. One proposed experiment in the UK involves spraying a fine mist of sea water into the atmosphere to brighten clouds, while another looks at sending safe mineral dust into the upper atmosphere without releasing it—just to observe how it interacts with its environment. There are also studies that consider placing giant mirrors or shades in space to reduce the amount of sunlight reaching Earth.

Despite the promise of these technologies, many scientists are concerned. They argue that SRM does not deal with the root cause of climate change—carbon dioxide in the atmosphere. While these methods might reduce global temperatures, they could also cause serious side effects, like changing rainfall patterns or triggering droughts in sensitive regions such as the Amazon rainforest. There are fears that focusing on SRM might distract governments from their primary responsibility to cut greenhouse gas emissions.

The UK government has promised that no dangerous materials will be released and that all experiments will go through careful safety checks and public consultations. Still, public trust in such efforts could be challenged by conspiracy theories like “chemtrails,” which wrongly claim that governments are already manipulating the weather. Experts agree that while these technologies might offer a backup plan, they must be approached with extreme care and should not replace efforts to reduce carbon emissions.