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In the wake of observations  around Ozone layer being highlighted, which of the following statements is true:

A. The report indicated that there have been decreases in atmospheric abundance of gases such as chlorofluorocarbons (CFCs) and halons

B. Increased use of certain CFC substitutes , however, can undo the gains made

C. The assessment was carried out by the United Nations Environment Programme (UNEP) and the World Meteorological Organization (WMO)

D. The Scientific Assessment of Ozone Depletion, 2014 was prepared and reviewed by 282 scientists from 36 countries

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