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New research reveals that more than 74,000 tonnes of three new chlorofluorocarbons (CFCs) and one new hydrochlorofluorocarbon (HCFC) have been released into the atmosphere. Scientists made the discovery by comparing today's air samples with air trapped in polar firn snow - which provides a century-old natural archive of the atmosphere. They also looked at air collected between 1978 and 2012 in unpolluted Tasmania. [Source: University of East Anglia]
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