Iron deliberately dumped into a patch of ocean has triggered a chain of events that pulls carbon dioxide out of the atmosphere and keeps it out. An explosion of microscopic life fertilized by the metal sank to the depths of the ocean after soaking up the greenhouse gas.
Geoengineering advocates who think iron could be useful for combating climate change will probably be heartened by the new finding, reported in the July 19 Nature. Carbon stuck on the seafloor tends to stay there a long time.
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