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A chemical used in dry cleaning and fire extinguishers may have been phased out in recent years but NASA said Wednesday that carbon tetrachloride is still being spewed into the atmosphere from an unknown source. The world agreed to stop using CC14 as part of the Vienna Convention on Protection of the Ozone Layer and its Montreal Protocol, which attained universal ratification in 2009. CC14 levels are not enough to reverse the decreasing trend of ozone-depletion, but experts are still mystified as to where it is coming from. With no new reported emissions, atmospheric concentrations of the compound should have declined at an expected rate of four percent per year since 2007.



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