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I found this article interesting so am posting here.
https://www.knowablemagazine.org/article/physical-world/2019...

Ancient rocks suggest that ice entirely covered our planet on at least two occasions. This theory may help explain the rise of complex life that followed.

Geologists were struggling to understand what they saw in the geologic record — that not too long before the first appearance of complex life, there was unmistakable evidence of glaciation even in the warmest areas of the Earth.


Much more at link.
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Much more at link.

What I wish was at the link: "What was the atmospheric CO2 level at various points in these fluctuations?"
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