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    The ozone layer was destroyed during Earth's biggest mass extinction

    Fossils show plants were producing higher levels of sunscreen chemicals to protect against higher ultraviolet light levels at the end of the..
    https://www.newscientist.com/article/2353582-the-ozone-layer-was-destroyed-during-earths-biggest-mass-extinction/?utm_campaign=RSS%7CNSNS&utm_source=NSNS&utm_medium=RSS&utm_content=home

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