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After about 30 years of trying to gradually eliminate hydrochlorofluorocarbons, harmful gases that deplete the ozone layer and warm the planet, researchers have detected for the first time a significant drop in the levels of these substances in the atmosphere and a consequent reduction in the ozone layer depletion potential:This is reported by new research conducted by scientists from the University of Bristol and published in the scientific journal Nature.The authors explained that global concentrations of such gases peaked in 2021 – five years earlier than expected – and that since then there has been a decline which represents a significant "milestone" in blocking dangerous ultraviolet solar radiation.“This is a remarkable success story that shows how global policies are protecting the planet,” commented Veerabhadran Ramanathan, a climate scientist at the University of California who was not involved in the study. It was more than 50 years ago when...