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March 21 2014

Airborne Iron May Have Helped Cause Past Ice Ages


It seems straightforward: Iron-rich dust floating on the wind falls into the sea, where it nourishes organisms that suck carbon dioxide from the air. Over time, so much of this greenhouse gas disappears from the atmosphere that the planet begins to cool. Scientists have proposed that such a process contributed to past ice ages, but they havenít had strong evidenceóuntil now.

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