Evidence of a Snowball Earth phase is not definitive, but that graph doesn't go back far enough. https://en.wikipedia.org/wiki/Snowball_Earth https://en.wikipe

Evidence of a Snowball Earth phase is not definitive, but that graph doesn't go back far enough. https://en.wikipedia.org/wiki/Snowball_Earth https://en.wikipedia.org/wiki/Snowball_Earth, https://en.wikipedia.org/wiki/Huronian_glaciation https://en.wikipedia.org/wiki/Huronian_glaciation