Head in a Cloud

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Early Earth: Not So Hot?

February 15th, 2007 · No Comments

Early Earth was a strange place. Take incident solar radiation, for example. The Sun had about 80% of its current intensity 2.5 billion years ago. Today, if you placed a giant screen over the sun and blocked out 20% of the light emitted, the Earth’s average surface temperature would be below water’s freezing point. Yet, [...]

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Tags: climate