LONDON Founder of Barocal Professor Xavier Moya with prototype cooling technology, at their headquarters in Cambridge, on May 9, 2025. The soft, waxy "solid refrigerant" being investigated in a U.K. laboratory may not look very exciting, but its unusual properties promise an air-conditioning revolution that could eliminate the need for greenhouse gases . "They don't contribute to global warming, but also they are potentially more energy efficient," Xavier Moya, a professor of materials physics