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Scientists have caught a whiff of a banned gas CFC-11 in the atmosphere, prompting questions about who is emitting it and what it is doing there. CFC-11 belongs to the cadre of compounds called chlorofluorocarbons (CFCs), infamous for creating a hole in Earth's ozone layer. These chemicals have long life spans and can persist in the atmosphere for several decades once they get there. In this time, they may reach the upper atmosphere and destroy the ozone. [Source: The Wire (India)]
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