A long time ago, the Earth was very cold. 
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🖼️ Images & Media (6)
Evolution of temperature in the...
20191021 Temperature from 20,000 to...
Pleistocene north ice map.jpg
Co2 glacial cycles 800k.png
Earth 1.00Ma.png
Pleistocene Chart.jpg
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Content adapted from Wikipedia
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Readability: FK 11.9
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Vital Level 5