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In a perspective piece appearing in an issue of Science, NASA researchers discuss the nuances that distinguish three categories of compounds and their impacts on upper atmospheric ozone: long-lasting and human-made compounds, short-lived and human-made compounds, and compounds that are short-lived and naturally emitted from the ocean. All of the long-lasting and some of the anthropogenic short-lived compounds are controlled by the Montreal Protocol in order to reduce their impact on ozone. The researchers find that long-lasting compounds still dominate the outlook for ozone recovery. [Source: Phys.org]
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