Fossil raindrop impressions imply greenhouse gases loaded early Earth's atmosphere
Wednesday, March 28, 2012 - 12:03
in Earth & Climate
In ancient Earth history, the sun burned as much as 30 percent dimmer than it does now. Theoretically that should have encased the planet in ice, but there is geologic evidence for rivers and ocean sediments between 2 billion and 4 billion years ago.
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