what emission from human activities lead to ozone depletion? and what are the principal steps in stratospheric ozone depletion caused by human activities?
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The initial step in the depletion of stratospheric ozone by human activities is the emission, at Earth's surface, of ozone-depleting gases containing chlorine and bromine. Most of these gases accumulate in the lower atmosphere because they are unreactive and do not dissolve readily in rain or snow.
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