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What is the precise meaning of the sentence below? What remained in the atmosphere? The asteroid? How can that cause CO2? I am looking for a clear explanation.

Even after the skies cleared, the enormous amounts of CO2 released when the asteroid impacted the limestone layer in the earth’s crust remained in the atmosphere, causing a massive greenhouse effect that lasted for thousands of years.

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  • An asteroid had collided with the Earth. This released enormous amounts of CO2, which remained in the atmosphere.
    – Kate Bunting
    Commented Apr 1, 2021 at 11:43

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Even after the skies cleared, the enormous amounts of CO2 (released when the asteroid impacted the limestone layer in the earth’s crust) remained in the atmosphere, causing a massive greenhouse effect that lasted for thousands of years.

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