A fifth of Earth’s geologic history might have vanished because of glaciers
Kudos to real scientists who bit by bit uncovers what happened in earths past, in ever-increasing resolution.<p>Whether &quot;snowball earth&quot; is accurate or not, what appears in outline is an earth that would have been uninhabitable for humans under most of, and even in relative recent, geological history.<p>It begs the question of how we might deal with the situation where the globe once again becomes uninhabitable (if we survive that long): terraforming or cocooning. The latter seems the best bet.