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Posted Tue Mar 16 2010: from New York Times:
A Risk of Poisoning the Deepest Wells
Fertilizing the oceans with iron has been proposed as a way of fighting climate change. The idea is that iron will promote blooms of phytoplankton that will remove carbon dioxide from the atmosphere through photosynthesis. When the phytoplankton dies and sinks, the carbon will effectively be sequestered in the deep ocean. Enthusiasm for the idea has waned, in part because of concerns about large-scale manipulation of ocean ecosystems. Now, a study in The Proceedings of the National Academy of Sciences points out a specific risk: by promoting the growth of certain organisms, iron enrichment may result in the harmful production of a neurotoxin[, domoic acid].... The researchers found evidence that increased domoic acid production enabled Pseudonitzschia to outcompete other phytoplankton. "So it's more toxic than it was before," Dr. Trick said, "and there's more of it."
[Read more stories about: geoengineering, unintended consequences, ecosystem interrelationships]
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'Doc Jim says:
Good thing we have other consequence-free geoengineering options to turn to!

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