Scientists have developed ionocaloric cooling, a new refrigeration process that could replace current methods and be safer and more environmentally friendly. The process involves using ions to force materials to absorb and shed heat energy, cooling the surroundings. Initial experiments with a salt made with iodine and sodium showed promising results, achieving a temperature shift of 25 degrees Celsius with less than a single volt of charge. The technology aims to address the environmental impact of traditional refrigerants, such as hydrofluorocarbons, and could play a significant role in reducing greenhouse gas emissions. Researchers now plan to scale up the technology for practical commercial use.