Usage for hash tag: UVradiation

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    Share 6 phút thú vị khám phá về tầng ôzôn là gì ?

    ...the atmosphere. * The Montreal Protocol is an international treaty that was signed in 1987 to phase out the production and use of CFCs. * The ozone layer will not fully recover until the early 2050s. ### Hashtags * #ozonelayer * #ozone depletion * #MontrealProtocol * #UVradiation * #Skincancer
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