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Ozone depletion is a well-known phenomenon and, thanks to the success of the Montreal Protocol, is widely perceived as a problem solved. But an international team of researchers has now found an unexpected, growing danger to the ozone layer from substances not regulated by the treaty. One of the new threats is dichloromethane, a substance with uses varying from paint stripping to agricultural fumigation and the production of pharmaceuticals. [Source: European Geosciences Union]
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