那些植物可能导致了下一次大冰河期的到来。

And those plants may have caused the next great ice age.

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在大冰河期，二氧化碳含量水平怎么会高呢？

How come a big ice age happened when carbon dioxide levels were high?

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Andean - Saharan冰河期横跨了Ordovician冰河期的后期和Silurian冰河期的前期，大灭绝成为了其标志性事件，那是地球历史上第二个气候最恶劣的时期。

Straddling the late Ordovician period and the early Silurian period, the Andean-Saharan ice age was marked by a mass extinction, the second most severe in Earth's history.

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