NPR's John Nielsen reports that increasing the supply of iron in the world's oceans could help fight global warming. More iron in the ocean generates larger phytoplankton which in turn soak up carbon dioxide, the main contributor to global warming. The idea, known as the "iron hypothesis," has been around for years, but is slowly gaining more currency among oceanographers. (3:40) (Stations: studies on the topic are featured in the latest edition of the journal, "Nat
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