Culprit for Mass Extinction 445 Million Years Ago? Global Warming - The New York Timeshttps://www.nytimes.com/2020/06/10/science/global-warming-ordovician-extinction.html
Articles in the New York TimesCarbon dioxideGlaciers, icebergs and sea iceLate Ordovician mass extinction (LOME)Mercury (chemical element)MolybdenumOrdovician periodOxygenUraniumVolcanic eruptions
Ordovician–Silurian extinction events - Wikipediahttps://en.wikipedia.org/wiki/Ordovician%E2%80%93Silurian_extinction_events
Late Ordovician mass extinction (LOME)Ordovician-Silurian extinction events

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Late Ordovician mass extinction (LOME)
Ordovician-Silurian extinction events