I believe I understand how snowball earths can arise (more plants -> less greenhouse gasses -> colder climate). What I don’t get is how snowball earths can get out of the cold spiral. Is it catastrophic meteoric events? Volcanoes adding more CO2 without any plants to consume it?
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Yes volcanoes. "The Story of Earth" touches on it. Good book.
I remember supervolcano eruptions being postulated as way to break cycle.
(in addition to longterm heavy volcanism/impacts)