Ozone-Depleting Compound Persists Over Antarctica Despite Ban on Chlorofluorocarbons


Earth’s atmosphere contains an unexpectedly large amount of an ozone-depleting chemical compound from an unknown source, surpassingly, decades after the compound was banned worldwide, according to new research out from NASA published in the Aug. 18 issue of Geophysical Research Letters. Carbon tetrachloride (CCl4), once used in dry cleaning and fire-extinguishers, was regulated in 1987…