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During the Carboniferous period after trees developed but before fungus developed the ability to break down cellulose.
Trees pulled lots of carbon from the atmosphere and sequestered it, but nothing was capable of breaking them down so they just piled up, literally. It was enough to cause a cooling event.
Not a scientist or geologist. But I can recommend the Wikipedia article about Carbon dioxide in the atmosphere. Or one of the TV documentaries about the ice core drillings in the Antarctic.