Nature World News: Researchers have found four new man-made gases that are depleting the ozone blanket.
University of East Anglia researchers say that more than 74,000 metric tons of these gases have been released in the atmosphere. The gases include three new chlorofluorocarbons (CFCs) and one hydrochlorofluorocarbon (HCFC).
For the study, researchers looked at air samples obtained from polar firm snow- which is like a catalogue of atmospheric conditions that existed a century ago. They compared these air samples...