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Snowball Earth: The Story of the Global Catastrophe That Spawned Life as We Know it Book
The idea that the Earth has been completely frozen over by ice and snow might seem fanciful and deeply worrying, if true. Gabrielle Walker's Snowball Earth is the remarkable story of the theory, the evidence for it, the geologists who are behind it and those against it. The bad news is that it is highly likely to be true. As Gabrielle Walker expertly explains for the general reader, there have indeed been several such runaway glacial events. Polar ice caps, continental ice sheets and sea ice grew to such an extent that they all met in the tropics and our green and pleasant planet was whited out. The good news is that it all happened a very long time ago, the last time around 650 million years ago and is highly unlikely to happen again, even in the distant future. Snowball Earth theory has … read more...
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