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So first of all, the ozone layer, the stratospheric ozone layer that protects the Earth from otherwise being sterilized, that ozone layer has been damaged by chemicals
humans put there-- most of all the chlorofluorocarbons, chlorine-containing compounds, but also nitrogen oxides.
And in ways that are too complicated to explain right now, it turns out that adding sulfuric acid accelerates those reactions in some ways.
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