NASA reports unknown source of banned ozone-destroying compound

ENN
Aug 21, 2014, 8:33 am45 pts
NASA research has revealed the Earth's atmosphere contains an unexpectedly large amount of an ozone-depleting compound from an unknown source decades after the compound was banned worldwide. Carbon tetrachloride (CCl4), which was once used in applications such as dry cleaning and as a fire-extinguishing agent,…

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